zoukankan      html  css  js  c++  java
  • JSon_零基础_003_将Map集合对象转换为JSon格式的对象字符串,返回给界面

    将Map集合对象转换为JSon格式的对象字符串,返回给界面

    需导入的jar包:

    编写servlet:

    package com.west.webcourse.servlet;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.util.HashMap;
    import java.util.Map;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import net.sf.json.JSONArray;
    
    public class JavaBeanToJOSNString extends HttpServlet {
    
        /** 第03步:重写doGet()方法,下一步:web.xml */
        @Override
        protected void doGet(HttpServletRequest request,
                HttpServletResponse response) throws ServletException, IOException {
            response.setContentType("text/html;charset=utf-8");
            PrintWriter out = response.getWriter();
            System.out.println("转换");
            out.print("转换后的JSON字符串:");
            /** 向浏览器发送JSon格式的字符串 */
            out.print(getMapToJsonString());
            out.flush();
            out.close();
        }
    
        /** 第02步:创建JSon格式字符串转换方法:将map类型转换成json类型字符串 */
        public String getMapToJsonString() {
            Map map=new HashMap();
            map.put("string", "字符串格式的数据!");
            map.put("bool",Boolean.TRUE);
            map.put("int", new Integer(1));
            map.put("array", new String[]{"zhang3","li4","wang5"});
            map.put("function", "function(arrayIndex){return this.arrayType[arrayIndex];}");
            JSONArray somesToJsonArray = JSONArray.fromObject(map);
            System.out
                    .println("com.west.webcourse.servlet.JavaBeanToJOSNString.java::"
                            + somesToJsonArray);
            return somesToJsonArray.toString();
        }
    }

    配置:web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
        <display-name></display-name>
        <!-- 第04步:配置servlet,下一步:personinfo.jsp -->
        <servlet>
            <description>This</description>
            <display-name>This</display-name>
            <servlet-name>JavaBeanToJOSNString</servlet-name>
            <servlet-class>com.west.webcourse.servlet.JavaBeanToJOSNString</servlet-class>
        </servlet>
        <servlet-mapping>
            <servlet-name>JavaBeanToJOSNString</servlet-name>
            <url-pattern>/javaBeanToJOSNString</url-pattern>
        </servlet-mapping>
    
        <welcome-file-list>
            <welcome-file>personinfo.jsp</welcome-file>
        </welcome-file-list>
    </web-app>

    编写:personinfo.jsp

    <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>My JSP 'personinfo.jsp' starting page</title>
        
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
    
      </head>
      
      <body>
          动态获得当前项目的ContextPath所对应的目录:${pageContext.request.contextPath}<br>
          <a href="javaBeanToJOSNString">向servlet发送请求</a>
          <br>
      </body>
    </html>
  • 相关阅读:
    img的srcset和sizes属性作用
    屏幕尺寸,分辨率,像素,PPI之间到底什么关系
    img 的 srcset、sizes 属性和 picture 元素
    收房细则
    购买雅居乐湖居笔记不得不知。
    Andoird Studio 错误: 非法字符: 'ufeff' 解决方案。
    解决mysql 1040错误Too many connections的方法
    Android布局优化之include、merge、ViewStub的使用
    美国人、英国人、中国人一生都是如何度过
    Android常用正则工具类
  • 原文地址:https://www.cnblogs.com/zjsy/p/4381294.html
Copyright © 2011-2022 走看看