java分页三个类 PageBean ResponseUtil StringUtil

Posted 2020-09-27

package ssmy.page;

/**
* 分页类
* @author Jesse
*
*/
public class PageBean
{
private int page;//第几页

private int pageSize;//每页显示的记录数
private int start ;//起始记录数
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getStart() {
return (page-1)*pageSize;
}
public void setStart(int start) {
this.start = start;
}
public PageBean(int page, int pageSize) {
super();
this.page = page;
this.pageSize = pageSize;

}

}

 

 

package ssmy.page;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

public class ResponseUtil {

public static void write(HttpServletResponse response,Object o)throws Exception{
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
out.println(o.toString());
out.flush();
out.close();
}
}

 

 

 

package ssmy.page;

/**
* 字符串工具类
* @author
*
*/
public class StringUtil {

/**
* 判断是否是空
* @param str
* @return
*/
public static boolean isEmpty(String str){
if(str==null||"".equals(str.trim())){
return true;
}else{
return false;
}
}

/**
* 判断是否不是空
* @param str
* @return
*/
public static boolean isNotEmpty(String str){
if((str!=null)&&!"".equals(str.trim())){
return true;
}else{
return false;
}
}

/**
* 格式化模糊查询
* @param str
* @return
*/
public static String formatLike(String str){
if(isNotEmpty(str)){
return "%"+str+"%";
}else{
return null;
}
}
}