冲刺
Posted xlk3
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徐利峰:
昨天的bug今天已经完成,原因是布局的问题,导致评论数据部分没有显示出来。解决的办法是:用滑动布局将照片和评论数据包裹起来,之后设置总体的布局与底部评论栏间隔开。这样就不会使评论框挡住评论的数据。
今天的完成:实现收藏,点赞,关注功能。
遇到的困难有,在使用handler+Thread,子线程不能直接修改UI,需要创建handler对象,然后在子线程中发消息,然后在handler中捕获所需消息,实现响应。学会这个后,接下来就好设计收藏,点赞,关注这些功能,同时在逻辑思考上要设置图标的颜色变化,在这里我学习了一个“如何判断当前的资源文件是哪一个”,第二个比较繁琐的地方就是“做web服务器的访问数据请求”,比较容易。
不得不说这个handler+Thread线程真棒
明天的任务:实现全局搜索(含搜索记录)
代码:android
package com.example.newbsh.UI.home.hometype.news.shownews; import androidx.annotation.NonNull; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.content.Context; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.text.method.ScrollingMovementMethod; import android.util.Log; import android.view.Gravity; import android.view.View; import android.view.inputmethod.InputMethodManager; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; import com.bumptech.glide.Glide; import com.bumptech.glide.request.RequestOptions; import com.example.newbsh.HttpUtil.HttpUtil; import com.example.newbsh.MainActivity; import com.example.newbsh.R; import com.example.newbsh.UI.home.hometype.news.shownews.comment.BlogComment; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.lang.ref.WeakReference; import java.util.Objects; public class ShowNewsActivity extends AppCompatActivity implements View.OnClickListener { TextView textViewtitle,textViewdoc,textViewdate,textViewbkauthorname; LinearLayout piclinearLayout,commentLayout; TextView msg; Button send; private ImageView support,collect,bkphoto; private Button attention; private String title,authorname; private String username= MainActivity.getUserName(); private ShowBlogHandler blogHandler; String url; @RequiresApi(api = Build.VERSION_CODES.M) @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_show_news); blogHandler = new ShowBlogHandler(this); init();//初始化文章的内容 isAttention();//判断是否关注 isCollect();//判断是否收藏 isSupport();//判断是否点赞 showComment();//展示评论 } private void init() { textViewtitle = findViewById(R.id.NewsTitle); textViewdoc = findViewById(R.id.Newsdoc); textViewdate = findViewById(R.id.Newsdate); piclinearLayout=findViewById(R.id.picturelinearlayout); commentLayout=findViewById(R.id.comment_layout); textViewdoc.setMovementMethod(new ScrollingMovementMethod()); support=findViewById(R.id.support); collect=findViewById(R.id.collect); attention=findViewById(R.id.attention); msg=findViewById(R.id.msg); send=findViewById(R.id.send); bkphoto=findViewById(R.id.userphoto); textViewbkauthorname=findViewById(R.id.bkname); initdoc(); support.setOnClickListener(this); collect.setOnClickListener(this); attention.setOnClickListener(this); send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String comment=msg.getText().toString(); if(comment.isEmpty()){ Toast.makeText(ShowNewsActivity.this, "发送内容不能为空", Toast.LENGTH_SHORT).show(); return; } writeComment(comment); //开启线程 } }); } public void onClick(View v) { switch (v.getId()) { case R.id.attention: attentionAction(); break; case R.id.collect: collectAction(); break; case R.id.support: supportAction(); break; default: break; } } private void isSupport() { //是否点赞 new Thread(new Runnable() { @Override public void run() { Log.d("data", "点赞"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findsupport?username=" + username + "&title=" + title + ""; boolean isthumb = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 300; msg.obj = isthumb; blogHandler.sendMessage(msg); Log.d("点赞", String.valueOf(isthumb)); } }).start(); } private void isCollect() { //是否收藏 new Thread(new Runnable() { @Override public void run() { Log.d("data", "收藏"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findcollect?username=" + username + "&title=" + title + ""; boolean isStore = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 400; msg.obj = isStore; blogHandler.sendMessage(msg); Log.d("收藏", String.valueOf(isStore)); } }).start(); } private void isAttention() { //是否关注 new Thread(new Runnable() { @Override public void run() { Log.d("data", "关注"); String requrl = "http://39.97.181.86/BaiXiaoSheng/findattention?username=" + username + "&authorname=" + authorname + ""; boolean isAttention = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 500; msg.obj = isAttention; blogHandler.sendMessage(msg); Log.d("关注", String.valueOf(isAttention)); } }).start(); } private void attentionAction() { new Thread(new Runnable() { @Override public void run() { String text = attention.getText().toString(); String requrl = "http://39.97.181.86/BaiXiaoSheng/attentionaction?username=" + username + "&authorname=" + authorname + "&type=" + text.equals("关注") + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 700; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private void collectAction() { new Thread(new Runnable() { @Override public void run() { String requrl = "http://39.97.181.86/BaiXiaoSheng/collectaction?username=" + username + "&title=" + title + "&" + "type=" + judegIsDraw(collect) + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 800; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private void supportAction() { new Thread(new Runnable() { @Override public void run() { String requrl = "http://39.97.181.86/BaiXiaoSheng/supportaction?username=" + username + "&title=" + title + "&" + "type=" + judegIsDraw(support) + ""; boolean flag = Boolean.parseBoolean(String.valueOf(HttpUtil.sendPost(requrl, ""))); Message msg = new Message(); msg.what = 900; msg.obj = flag; blogHandler.sendMessage(msg); } }).start(); } private boolean judegIsDraw(View view) { //判断当前资源文件 boolean flag=false; switch (view.getId()) { case R.id.collect: flag= Objects.equals(((ImageView) view).getDrawable().getCurrent().getConstantState(), getResources().getDrawable(R.drawable.ic_turned_in_not).getConstantState()); Log.d("collect",String.valueOf(flag)); break; case R.id.support: flag= Objects.equals(((ImageView) view).getDrawable().getCurrent().getConstantState(), getResources().getDrawable(R.drawable.ic_thumb_not_up).getConstantState()); Log.d("support",String.valueOf(flag)); break; default: break; } return flag; } /* 写评论调用的线程 */ private void writeComment(String comment) { new Thread(new Runnable() { @Override public void run() { String reqdata="http://39.97.181.86/BaiXiaoSheng/sendnewscomment?username="+username+"&comment="+comment+"&title="+title; String json=String.valueOf(HttpUtil.sendPost(reqdata,"")); Message msg=new Message(); msg.what=1000; msg.obj=json; blogHandler.sendMessage(msg); Log.d("writecomment",json); } }).start(); } /* 初始化展示该博客的评论内容 */ private void showComment() { new Thread(new Runnable() { @Override public void run() { Log.d("data", "评论"); String requrl="http://39.97.181.86/BaiXiaoSheng/findallcomments?title="+title; String json = String.valueOf(HttpUtil.sendPost(requrl, "")); Message msg = new Message(); msg.what = 600; msg.obj = json; blogHandler.sendMessage(msg); Log.d("评论", json); } }).start(); } /* 加载新闻文章 */ private void initdoc() { Bundle bundle = getIntent().getExtras(); /* 获取图片的链接 */ url=bundle.getString("url"); String []urls=url.split(" "); /* 设置文章的内容 */ if (bundle != null) { title=bundle.getString("title"); textViewtitle.setText(bundle.getString("title")); textViewdoc.setText(bundle.getString("doc")); textViewdate.setText("文章发布时间为:"+bundle.getString("date")); textViewbkauthorname.setText(bundle.getString("authorname")); authorname=bundle.getString("authorname"); Glide.with(this) .load(bundle.getString("authorurl")) .circleCrop() .into(bkphoto); } else { Log.i("bundle", "为空。。。。。。"); } /* 动态加载图片 */ RequestOptions options = new RequestOptions() .error(R.drawable.error) .placeholder(R.drawable.loading); for(int i=0;i<urls.length;i++) { ImageView imageView=new ImageView(this); Glide.with(this) .load(urls[i]) .apply(options) .into(imageView); LinearLayout.LayoutParams layout = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); layout.setMargins(0, 10, 0, 0); imageView.setLayoutParams(layout); piclinearLayout.addView(imageView); } } static class ShowBlogHandler extends Handler { //防止内存泄漏 private final ShowNewsActivity mcontext; ShowBlogHandler(ShowNewsActivity activity) { WeakReference<ShowNewsActivity> weakReference = new WeakReference<>(activity); mcontext = weakReference.get(); } @SuppressLint("SetTextI18n") @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); switch (msg.what) { case 300: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.support.setImageResource(R.drawable.ic_thumb_up); break; case 400: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.collect.setImageResource(R.drawable.ic_turned_in); break; case 500: if (Boolean.parseBoolean(msg.obj.toString())) mcontext.attention.setText("已关注"); break; case 600: try { JSONArray comments = new JSONArray(msg.obj.toString()); Log.i("length:", ""+comments.length()); for (int i = 0; i < comments.length(); i++) { JSONObject object = comments.getJSONObject(i); BlogComment blogComment = new BlogComment(mcontext); if (!object.isNull("imgurl")) { Glide.with(mcontext) .load(object.getString("imgurl")) .circleCrop() .into(blogComment.getImageView()); } blogComment.getName().setText(object.getString("username")); blogComment.getComment().setText(object.getString("comment")); blogComment.getDate().setText(object.getString("date")); Log.i("次数:", ""+object.getString("comment")); mcontext.commentLayout.addView(blogComment,0); } } catch (JSONException e) { e.printStackTrace(); } break; case 700: if (Boolean.parseBoolean(msg.obj.toString())) { String text = mcontext.attention.getText().toString(); if (text.equals("关注")) { mcontext.attention.setText("已关注"); Toast toast = Toast.makeText(mcontext, "关注成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.attention.setText("关注"); Toast toast = Toast.makeText(mcontext, "已取消关注", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因,操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } break; case 800: if (Boolean.parseBoolean(msg.obj.toString())) { if (mcontext.judegIsDraw(mcontext.collect)) { mcontext.collect.setImageResource(R.drawable.ic_turned_in); Toast toast = Toast.makeText(mcontext, "收藏成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.collect.setImageResource(R.drawable.ic_turned_in_not); Toast toast = Toast.makeText(mcontext, "已取消收藏", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因,操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } break; case 900: if (Boolean.parseBoolean(msg.obj.toString())) { if (mcontext.judegIsDraw(mcontext.support)) { mcontext.support.setImageResource(R.drawable.ic_thumb_up); Toast toast = Toast.makeText(mcontext, "点赞成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } else { mcontext.support.setImageResource(R.drawable.ic_thumb_not_up); Toast toast = Toast.makeText(mcontext, "已取消点赞", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } } else { Toast toast = Toast.makeText(mcontext, "未知原因,操作失败", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } break; case 1000: try { JSONObject object=new JSONObject(msg.obj.toString()); BlogComment blogComment=new BlogComment(mcontext); blogComment.getDate().setText(object.getString("date")); blogComment.getComment().setText(object.getString("comment")); blogComment.getName().setText(object.getString("username")); if(!object.isNull("imgurl")){ if(object.getString("imgurl").length()>0) Glide.with(mcontext) .load(object.getString("imgurl")) .circleCrop() .into(blogComment.getImageView()); } mcontext.commentLayout.addView(blogComment,0); mcontext.msg.setText(""); mcontext.msg.clearFocus(); InputMethodManager imm= (InputMethodManager) mcontext.getSystemService(Context.INPUT_METHOD_SERVICE); //键盘收缩 if (imm != null) { imm.hideSoftInputFromWindow(mcontext.msg.getWindowToken(),0); } Toast toast = Toast.makeText(mcontext, "评论成功", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); } catch (JSONException e) { e.printStackTrace(); } break; default: break; } } } }
李浩:实现写博客功能,可以上传图片。
UI界面设计:
由于博客发布可能附加图片,但是图片(或者任何文件)信息必须放在http请求体的正文之中,这就需要我们使用HttpUrlConnection的时候构建Http正文。
我们先来看一下Http正文格式:
1 POST /api/feed/ HTTP/1.1 2 Accept-Encoding: gzip 3 Content-Length: 225873 4 Content-Type: multipart/form-data; boundary=OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp 5 Host: www.myhost.com 6 Connection: Keep-Alive 7 8 --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp 9 Content-Disposition: form-data; name="lng" 10 Content-Type: text/plain; charset=UTF-8 11 Content-Transfer-Encoding: 8bit 12 13 116.361545 14 --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp 15 Content-Disposition: form-data; name="lat" 16 Content-Type: text/plain; charset=UTF-8 17 Content-Transfer-Encoding: 8bit 18 19 39.979006 20 --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp 21 Content-Disposition: form-data; name="images"; filename="/storage/emulated/0/Camera/jdimage/1xh0e3yyfmpr2e35tdowbavrx.jpg" 22 Content-Type: application/octet-stream 23 Content-Transfer-Encoding: binary 24 25 这里是图片的二进制数据 26 --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp--
格式分析
请求头分析
POST /api/feed/ HTTP/1.1
这一行就说明了这个请求的请求方式,即为POST方式,要请求的子路径为/api/feed/,例如我们的服务器地址为www.myhost.com,然后我们的这个请求的完整路径就是www.myhost.com/api/feed/,最后说明了HTTP协议的版本号为1.1。
Accept-Encoding: gzip Content-Length: 225873 Content-Type: multipart/form-data; boundary=OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp Host: www.myhost.com Connection: Keep-Alive
--OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp
我们知道HTTP协议采用“请求-应答”模式,当使用普通模式,即非KeepAlive模式时,每个请求/应答客户和服务器都要新建一个连接,完成之后立即断开连接(HTTP协议为无连接的协议);当使用Keep-Alive模式(又称持久连接、连接重用)时,Keep-Alive功能使客户端到服务器端的连接持续有效,当出现对服务器的后续请求时,Keep-Alive功能避免了建立或者重新建立连接。
请求实体分析
1 --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp 2 Content-Disposition: form-data; name="lng" 3 Content-Type: text/plain; charset=UTF-8 4 Content-Transfer-Encoding: 8bit 5 6 116.361545
1 Content-Type: text/plain; charset=UTF-8 2 Content-Transfer-Encoding: 8bit
文件参数:
1 Content-Type: application/octet-stream 2 Content-Transfer-Encoding: binary
参数实体的最后一行是: --加上boundary加上--,最后换行,这里的 格式即为: --OCqxMF6-JxtxoMDHmoG5W5eY9MGRsTBp--。
具体代码如下:
1 public static void sendPostImg(String actionUrl, Map<String, File> files) throws IOException { 2 3 String BOUNDARY = java.util.UUID.randomUUID().toString(); //利用系统工具类生成界限符 4 String PREFIX = "--", LINEND = " "; 5 String MULTIPART_FROM_DATA = "multipart/form-data"; 6 String CHARSET = "UTF-8"; 7 8 URL uri = new URL(actionUrl); 9 HttpURLConnection conn = (HttpURLConnection) uri.openConnection(); 10 conn.setReadTimeout(5 * 1000); // 缓存的最长时间 11 conn.setDoInput(true);// 允许输入 12 conn.setDoOutput(true);// 允许输出 13 conn.setUseCaches(false); // 不允许使用缓存 14 conn.setRequestMethod("POST"); 15 conn.setRequestProperty("connection", "keep-alive"); 16 conn.setRequestProperty("Charsert", "UTF-8"); 17 conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY); 18 19 // // 首先组拼文本类型的参数 20 // StringBuilder sb = new StringBuilder(); 21 // for (Map.Entry<String, String> entry : params.entrySet()) 22 // { 23 // sb.append(PREFIX); 24 // sb.append(BOUNDARY); 25 // sb.append(LINEND); 26 // sb.append("Content-Disposition: form-data; name="" + entry.getKey() + """ + LINEND); 27 // sb.append("Content-Type: text/plain; charset=" + CHARSET + LINEND); 28 // sb.append("Content-Transfer-Encoding: 8bit" + LINEND); 29 // sb.append(LINEND); 30 // sb.append(entry.getValue()); 31 // sb.append(LINEND); 32 // } 33 34 DataOutputStream outStream = new DataOutputStream(conn.getOutputStream()); 35 // outStream.write(sb.toString().getBytes()); 36 InputStream in = null; 37 // 发送文件数据 38 if (files != null) 39 { 40 for (Map.Entry<String, File> file : files.entrySet()) 41 { 42 StringBuilder sb1 = new StringBuilder(); 43 sb1.append(PREFIX); 44 sb1.append(BOUNDARY); 45 sb1.append(LINEND); 46 // name是post中传参的键 filename是文件的名称 47 sb1.append("Content-Disposition: form-data; name="file"; filename="" + file.getValue().getName() + """ + LINEND); 48 sb1.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINEND); 49 sb1.append("Content-Transfer-Encoding: binary"+LINEND); 50 sb1.append(LINEND); 51 outStream.write(sb1.toString().getBytes()); 52 Log.d("file",sb1.toString()); 53 InputStream is = new FileInputStream(file.getValue()); 54 byte[] buffer = new byte[1024]; 55 int len = 0; 56 while ((len = is.read(buffer)) != -1) 57 { 58 outStream.write(buffer, 0, len); 59 } 60 61 is.close(); 62 outStream.write(LINEND.getBytes()); 63 } 64 65 // 请求结束标志 66 byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes(); 67 outStream.write(end_data); 68 outStream.flush(); 69 // 得到响应码 70 int res = conn.getResponseCode(); 71 if (res == 200) 72 { 73 in = conn.getInputStream(); 74 int ch; 75 StringBuilder sb2 = new StringBuilder(); 76 while ((ch = in.read()) != -1) 77 { 78 sb2.append((char) ch); 79 } 80 Log.d(TAG,"状态码:"+res); 81 }else{ 82 Log.d(TAG,"状态码:"+res); 83 } 84 outStream.close(); 85 conn.disconnect(); 86 } 87 // return in.toString(); 88 }
代码是我参考其他博客改的,按照我自己的需求,将一些参数附加到URL后传输,Http正文只传输文件,因为我的参数决定了文件的命名格式,这样后台不用遍历查找参数后在遍历一次寻找文件了,当然,如果你的参数比较重要的话还是将参数写到Http正文中,这样较为安全。
后台文件接收代码:
1 String temppath="C:/Program Files/apache-tomcat-9.0.31-windows-x64/apache-tomcat-9.0.31/tempfile"; 2 String path="C:/Program Files/apache-tomcat-9.0.31-windows-x64/apache-tomcat-9.0.31/webapps/STDEverything/images/blog"; 3 4 String userid=request.getParameter("userid"); 5 String blogid=request.getParameter("blogid"); 6 7 DiskFileItemFactory disk = new DiskFileItemFactory(1024*10,new File(temppath)); 8 ServletFileUpload up = new ServletFileUpload(disk); 9 List<FileItem> list; 10 try { 11 list=up.parseRequest(request); 12 for(FileItem item:list) { 13 if(!item.isFormField()) { 14 InputStream inputStream=item.getInputStream(); 15 String filename=item.getName(); 16 String imgname=userid+"_"+DBUtil.getIdentifier()+"_"+filename; 17 OutputStream outputStream=new FileOutputStream(path+"/"+imgname); 18 System.out.println(imgname); 19 int len=0; 20 byte buff[]=new byte[1024]; 21 while((len=inputStream.read(buff))!=-1) { 22 outputStream.write(buff,0,len); 23 } 24 outputStream.flush(); 25 outputStream.close(); 26 inputStream.close(); 27 DBUtil.writeBlogImg(request.getRequestURL().substring(0,request.getRequestURL().lastIndexOf("/")) 28 +"/images/blog/"+imgname, blogid); 29 }else { 30 System.out.println(item.getFieldName()); 31 } 32 } 33 } catch (FileUploadException e) { 34 // TODO Auto-generated catch block 35 e.printStackTrace(); 36 response.getWriter().write("no"); 37 } 38 response.getWriter().write("yes");
要想运行上文中的代码接收文件,需要导入两个jar包,
链接:http://pan.baidu.com/s/1jIbyn5s 密码:84se
关于后台接收文件的学习可以参考这篇博客:
值得一提的是,当传输文件时,你的Http正文编码格式必须改为"multipart/form-data",然而改为这种格式之后,普通的request.getParameter方式就无法获取参数了,但可以获取fileitem.InputStream来进行转换,这也就是上文中说的为什么要遍历获取参数的原因。
至于Android项目的后期设想,因为博客图片是和博客id进行绑定的,而且我存进去的是该图片的网址,当后期显示博文的具体内容时,可以先请求下来博客网址信息,用Android的Glide插件异步加载图片。
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