4.Spring MVC入门
最编程
2024-02-23 09:12:13
...
package com.test.community.controller;
import com.test.community.service.AlphaService;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
/**
* @ClassName AlphaController
* @Description TODO
* @Author lcx
* @Date 2024/2/21 15:22
* @Version 1.0
*/
@Controller
@RequestMapping("/alpha")
public class AlphaController {
@Autowired
private AlphaService alphaService;
@RequestMapping("/hello")
@ResponseBody
public String sayHello() {
return "Hello Spring Boot!";
}
@RequestMapping("/data")
@ResponseBody
public String getData() {
return alphaService.find();
}
// SpringMVC获得请求对象和响应对象
@RequestMapping("/http")
public void http(HttpServletRequest request, HttpServletResponse response) {
// 获取请求数据
System.out.println(request.getMethod());
System.out.println(request.getServletPath());
Enumeration<String> enumeration = request.getHeaderNames();
while (enumeration.hasMoreElements()) {
String name = enumeration.nextElement();
String value = request.getHeader(name);
System.out.println(name + ":" + value);
}
// 请求体
System.out.println(request.getParameter("code"));
// 返回响应数据
response.setContentType("text/html; charset=utf-8");
try(
PrintWriter writer = response.getWriter();
) {
writer.write("<h1>牛客网</h1>");
} catch (IOException e) {
e.printStackTrace();
}
}
// GET请求
// 查询所有学生 /students?current=1&limit=20
@RequestMapping(path = "/students", method = RequestMethod.GET)
@ResponseBody
public String getStudents(
@RequestParam(name = "current", required = false, defaultValue = "1") int current,
@RequestParam(name = "limit", required = false, defaultValue = "10") int limit) {
System.out.println(current);
System.out.println(limit);
return "some students";
}
// /student/123
@RequestMapping(path = "/student/{id}", method = RequestMethod.GET)
@ResponseBody
public String getStudent(@PathVariable("id") int id) {
System.out.println(id);
return "a student";
}
// 浏览器向服务器提交数据
// POST请求
@RequestMapping(path = "/student", method = RequestMethod.POST)
@ResponseBody
public String saveStudent(String name, int age) {
System.out.println(name);
System.out.println(age);
return "success";
}
// 响应HTML数据
@RequestMapping(path = "/teacher", method = RequestMethod.GET)
@ResponseBody
public ModelAndView getTeacher() {
ModelAndView mav = new ModelAndView();
mav.addObject("name", "张三");
mav.addObject("age", 12);
mav.setViewName("/demo/view");
return mav;
}
@RequestMapping(path = "/school", method = RequestMethod.GET)
public String getSchool(Model model) {
model.addAttribute("name", "北京大学");
model.addAttribute("age", 123);
return "/demo/view";
}
// 异步请求中响应JSON数据
// java对象 -> JSON字符串 -> JS对象
@RequestMapping(path = "/emp", method = RequestMethod.GET)
@ResponseBody
public Map<String, Object> getEmp() {
Map<String, Object> emp = new HashMap<>();
emp.put("name", "张三");
emp.put("age", 12);
emp.put("salary", 8000.00);
return emp;
}
@RequestMapping(path = "/emps", method = RequestMethod.GET)
@ResponseBody
public List<Map<String, Object>> getEmps() {
List<Map<String, Object>> list = new ArrayList<>();
Map<String, Object> emp = new HashMap<>();
emp.put("name", "张三");
emp.put("age", 12);
emp.put("salary", 8000.00);
list.add(emp);
emp = new HashMap<>();
emp.put("name", "李四");
emp.put("age", 22);
emp.put("salary", 9000.00);
list.add(emp);
emp = new HashMap<>();
emp.put("name", "王五");
emp.put("age", 32);
emp.put("salary", 10000.00);
list.add(emp);
return list;
}
}
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