tomcat服务器用Servlet类查找磁盘文件上的Json信息，如果匹配则在浏览器上显示出该条内容的全部信息

最新推荐文章于 2025-02-25 23:19:44 发布

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本文介绍了一个用于查找学生信息的Servlet实现方式，通过GET请求读取本地JSON文件，并使用Gson库将JSON字符串转换为Java对象列表。当接收到带有名字参数的请求时，Servlet会在列表中搜索匹配的学生信息并返回。

package com.swift;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

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.google.gson.Gson;

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

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");
        BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream("d:/student.json"),"utf-8"));
        List<Student> list=new ArrayList<Student>();
        String str;
        while((str=br.readLine())!=null) {
            Gson gson=new Gson();
            Student stu=gson.fromJson(str, Student.class);
            list.add(stu);
        }
        br.close();
        String name=request.getParameter("name");
        for(Student stu:list) {
            if(stu.getName().equals(name)) {
                Gson gson=new Gson();
                String json=gson.toJson(stu);
                response.getWriter().println(json);
            }
        }
    }

    /**
     * @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);
    }

}