spring mvc代码示例

Handler对应的参数代码实敲

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.m.entity.User;

@Controller
@Scope("prototype")
@RequestMapping("/test2")
public class TestController2 {
	@RequestMapping("/t1")
	public void test1() {
		System.out.println("t1 已抵达");
	}
	@RequestMapping("/t2")
	public void test2(HttpServletRequest req, 
			HttpServletResponse resp,
				HttpSession session,
					ServletContext application
			) {
		System.out.println("t2 已抵达");
	}
	@RequestMapping("/t3")
	public void test3(String arg1 , Integer arg2) {
		System.out.println("t3 已抵达:" + arg1);
		System.out.println("t3 已抵达:" + arg2);
	}
	@RequestMapping("/t4")
	public void test4(User user,String username) {
		System.out.println("t4 已抵达:" + username);
		System.out.println("t4 已抵达:" + user);
	}
	
	
	//提取路径中的变量值
	@RequestMapping("/t5/{arg1}/{arg2}/{arg3}")
	public void test5(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3) {
		System.out.println("t5 已抵达:" + arg1);
		System.out.println("t5 已抵达:" + arg2);
		System.out.println("t5 已抵达:" + arg3);
	}
	
	//限制请求类型
	@RequestMapping(value = "/t6/{arg1}/{arg2}/{arg3}",
			method= {RequestMethod.POST,RequestMethod.GET})
	public void test6(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3) {
		System.out.println("t6 已抵达:" + arg1);
		System.out.println("t6 已抵达:" + arg2);
		System.out.println("t6 已抵达:" + arg3);
	}
	
	
	//限制请求参数
	@RequestMapping(value = "/t7/{arg1}/{arg2}/{arg3}",
			method= {RequestMethod.POST,RequestMethod.GET},
			params= "random=123")
	public void test7(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3) {
		System.out.println("t7 已抵达:" + arg1);
		System.out.println("t7 已抵达:" + arg2);
		System.out.println("t7 已抵达:" + arg3);
	}
	
	
	//ant风格，？号代表后面一个字符
	//id1,ida……允许
	//id11,idaa,id……不允许
	@RequestMapping(value = "/t8/{arg1}/{arg2}/{arg3}/id?")
	public void test8(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3) {
		System.out.println("t8 已抵达:" + arg1);
		System.out.println("t8 已抵达:" + arg2);
		System.out.println("t8 已抵达:" + arg3);
	}
	
	//ant风格，*号代表后面N个字符
	//id11,idaa,id……都允许
	@RequestMapping(value = "/t9/{arg1}/{arg2}/{arg3}/id*/{arg4}")
	public void test9(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3,
			@PathVariable String arg4) {
		System.out.println("t9 已抵达:" + arg1);
		System.out.println("t9 已抵达:" + arg2);
		System.out.println("t9 已抵达:" + arg3);
		System.out.println("t9 已抵达:" + arg4);
	}
	
	//ant风格，**号可以匹配任意长度，可空
	@RequestMapping(value = "/t10/{arg1}/{arg2}/{arg3}/**/{arg4}")
	public void test10(@PathVariable String arg1,
			@PathVariable String arg2,
			@PathVariable String arg3,
			@PathVariable String arg4) {
		System.out.println("t10 已抵达:" + arg1);
		System.out.println("t10 已抵达:" + arg2);
		System.out.println("t10 已抵达:" + arg3);
		System.out.println("t10 已抵达:" + arg4);
	}
	
	//ant风格
	//多路径映射
	@RequestMapping(value = {"test11","test12"})
	public void test11_12() {
		System.out.println("test11_12 已抵达");
	}
	
	//当参数某个值没有或者不匹配，required用来确定是否是必须的，默认是true；defaultValu表示当没有值的时候，给这个默认值
	@RequestMapping(value = "/t11")
	public void test11(@RequestParam(name="str",required=false,defaultValue="abc") String arg1,
			@RequestParam(name="num",required=false,defaultValue="123") int arg2) {
		System.out.println("t11 已抵达:" + arg1);
		System.out.println("t11 已抵达:" + arg2);
	}
	
	
	
	
	
}

Handler视图解析器代码实敲
配置文件配置视图解析器*

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
	<property name="prefix" value="/jsp/"/><!-- 前缀 -->
	<property name="suffix" value=".jsp"/><!-- 后缀 -->
</bean>

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;


@Controller
@Scope("prototype")
@RequestMapping("/test3")
public class TestController3 {
	//传统的jsp解析方式
	@RequestMapping("/t1")
	public void test1(HttpServletRequest req,
				HttpServletResponse resp) {
		try {
			System.out.println("t1 已抵达");
			//转发
			req.setAttribute("message", "this is mvc message1");
			req.getRequestDispatcher("/jsp/index.jsp").forward(req, resp);
		} catch (Exception e) {
			e.printStackTrace();
		} 
	}
	
	//通过ModelAndView
	@RequestMapping("/t2")
	public ModelAndView test2() {
		System.out.println("t2 已抵达");
		ModelAndView mv = new ModelAndView("/jsp/index.jsp");
		mv.addObject("message", "this is mvc message2");
		return mv;
	}
	
	//通过ModelMap
	@RequestMapping("/t3")
	public String test3(ModelMap map) {
		System.out.println("t3 已抵达");
		map.addAttribute("message", "this is mvc message3");
		return "/jsp/index.jsp";
	}
	
	//通过ModelMap了，通过解析器里面的前后缀，使得代码简洁
	@RequestMapping("/t4")
	public String test4(ModelMap map) {
		System.out.println("t4 已抵达");
		map.addAttribute("message", "this is mvc message4");
		return "index";
	}
	
	@RequestMapping("/t5")
	public String test5(ModelMap map,String arg1) {
		System.out.println("t5 已抵达");
		System.out.println("t5 已抵达:"+arg1);
		map.addAttribute("message", "this is mvc message5");
		return "forward:/jsp/index.jsp";
	}
	
	//通过forward完成内部controller之间的转发，重定向
	@RequestMapping("/t6")
	public String test6(ModelMap map) {
		System.out.println("t6 已抵达");
		return "forward:/test3/t5.do?arg1=abc";
	}
}

@ResponseBody返回json

@Controller
@Scope("prototype")
@RequestMapping("/test5")
public class TestController5 {
	@ResponseBody//把所有的返回类型变为json对象进行返回
	@RequestMapping("/ajax")
	public Object ajax() throws IOException {
		User user = new User();
		user.setId(1);
		user.setUsername("xxxx");
		user.setPassword("123");
		//map array list object string
		return user;
	}
	
}

本文地址：https://blog.csdn.net/weixin_43770224/article/details/110855014