在JavaWeb的开发过程中对json字符串的解析是比较常见的，那么怎么借助JavaScript去解析json字符串呢？这里直接上代码：
代码一一个 Servlet
package com.ghj.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.google.gson.Gson;
public class JsonServlet extends HttpServlet {
private static final long serialVersionUID = -699926309344319475L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/json;charset=utf-8");
PrintWriter out = response.getWriter();
Map<String, List<String>> dataMap = new HashMap<String, List<String>>();
List<String > gradeList = new ArrayList<String>();//年级
gradeList.add("初中一年级");
gradeList.add("初中二年级");
gradeList.add("初中三年级");
dataMap.put("gradeList", gradeList);
List<String> courseList = new ArrayList<String>();//课程
courseList.add("语文");
courseList.add("数学");
courseList.add("物理");
dataMap.put("courseList", courseList);
out.write(new Gson().toJson(dataMap));
out.flush();
out.close();
}
} 说明：这里使用了gson-2.2.2.jar包代码二——一个jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>首页</title>
<script type="text/javascript" src="<%=basePath%>js/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(function(){
$("#json").click(function(){
$.ajax({
type: "POST",
url: "<%=basePath%>JsonServlet",
success: function(data){
var grades = data.gradeList;
for(var index in grades){//年级
console.log(grades[index]);
}
var courses = data.courseList;
for(var index in courses){//课程
console.log(courses[index]);
}
},
error:function(){
alert("数据请求失败！");
}
});
});
});
</script>
</head>
<body>
<button id="json">JavaScript解析JSON字符串</button>
</body>
</html> 说明：上面代码没有借助JavaScript中的eval来解析json字符串