到tojsonstring报错

来源:2-2 请求流量分析统计-开发统计查询Servlet

慕哥0329292

2019-12-18 18:03:24

package caohongjie;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSON;



/**
 * Servlet implementation class FirstServlet
 */
@WebServlet("/FirstServlet")
public class FirstServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FirstServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        ServletContext context = request.getServletContext();
        List<String> TimeList = (List<String>) context.getAttribute("TimeList");
        List<Integer> ValueList = (List<Integer>) context.getAttribute("ValueList");
        System.out.println("上面收到了");
        response.setContentType("text/html;charset=utf-8");
//        response.getWriter().println(TimeList);
//        response.getWriter().println("<br/>");
//        response.getWriter().println(ValueList);        
        Map result = new HashMap();
        result.put("TimeList",TimeList);
        result.put("ValueList",ValueList);
        String ResJson = JSON.toJSONString(result);
        System.out.println(ResJson);
        System.out.println(result);
        System.out.println("收到了");
        response.getWriter().println(ResJson);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}


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1回答

好帮手慕酷酷

2019-12-18

同学你好,老师这边测试同学的代码中toJSONString()方法并没有报错哦~具体如下:

http://img.mukewang.com/climg/5dfa03da09f0c4ae07280175.jpg

建议同学进行检查jar包是否导入,并添加到bulid path下,具体如下:

http://img.mukewang.com/climg/5dfa044409a0093103230089.jpg

http://img.mukewang.com/climg/5dfa043e0909737007150526.jpg

然后清除eclipse缓存看一下,是否还有报错,或者重启一下eclipse。

http://img.mukewang.com/climg/5dfa04a50966c09002550257.jpg

如果我的回答解决了你的疑惑,请采纳!祝学习愉快!

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