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);
}
}
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:

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:


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

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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