利用JackSon工具将JSON文件和对象互转

Posted 2020-09-02 专注改变人生。

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　　1.　　需要下载JackSon工具，并导入到：

　　2.　　编写html页面：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户注册</title>
<script type="text/javascript" src="./js/lib/jquery.js"></script>
<script type="text/javascript">
/**
 * 验证两次输入密码是否一致
 */
	$(function(){

		$(\'#yanzheng\').blur(function(){
		
			if($(\'#passwd\')!=null){  //第一次输入的密码不为空
				if($(\'#passwd\').val()==$(\'#yanzheng\').val()){
					
				}else{
					alert("两次输入的密码不一样");
				}
			}else{	//第一次输入的密码为空
			}
		});
	});
</script>
</head>
<body>
	<div style="position:relative;left:50%">
	<h1 style=>用户注册</h1></div>
	<div style="position:relative;left:45%">
	<form action="servlet/regist" method="post">
		 用户名:<input type="text"  name="userName"/><br/>
		密  码:<input type="password" name="passWd" id="passwd" /><br/>
		确认密码:<input type="password" name="rePassWd" id="yanzheng"/><br/>
		性  别:<input type="radio" name="sex" value="男" />男
		<input type="radio" name="sex" value="女" />女<br/>
		<input type="submit" value="注册" />
	</form>
	</div>
</body>
</html>

　　3.　　编写 javabean

　　解析： bo是业务层，bo对象属性与用户输入的信息一一对应，本例用户输入的信息有userName、passWd、sex，所以javabean的User对象也有这三个属性。

package bo;

public class User {
	private String  userName;
	private String passWd;
	private String sex;
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public String getPassWd() {
		return passWd;
	}
	public void setPassWd(String passWd) {
		this.passWd = passWd;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	
}

　　4.　　编写servlet

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.fasterxml.jackson.databind.ObjectMapper;

import bo.User;

/**
 * Servlet implementation class Register
 */
public class Register extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * Default constructor. 
     */
    public Register() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");  　　　　//post方式用这种设置编码，如果是get方式，则用string.getBytes("ISO8859-1","utf-8")方法设置编码。
		response.setContentType("text/html;charset=UTF-8");
	
		
		//从浏览器获取用户信息
		String userName=request.getParameter("userName");
		String passWord=request.getParameter("passWd");
		String sex=request.getParameter("sex");
		
		//将用户信息装入javabean里
		User user=new User();
		user.setUserName(userName);
		user.setPassWd(passWord);
		user.setSex(sex);
		
		//将javabean转为json对象
		ObjectMapper mapper = new ObjectMapper(); 
		String json=mapper.writeValueAsString(user);	
		
		PrintWriter out=response.getWriter();
		out.print(json);
		out.close();
		
	}
}

结果：