初识 Spring(10)---(SpringMVC--向前台传递数据）
SpringMVC--向前台传递数据
在上篇博客基础上继续
第一种方式：返回一个ModelAndView
修改代码：SpringmvcTest.java
package com.neuedu.springmvc.controller;
import java.util.Date;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.neuedu.springmvc.po.User;
import com.sun.javafx.scene.accessibility.Attribute;
import com.sun.org.apache.bcel.internal.generic.NEW;
@Controller
//@RequestMapping("/test")
/*这是类*/
public class SpringmvcTest {
/*向前台传递数据的第一种方式：
1.返回一个ModelAndView*/
@RequestMapping("/testReturnData") //新增代码
public ModelAndView testReturnData() {
ModelAndView modelAndView= new ModelAndView();
modelAndView.addObject("date", new Date());
modelAndView.addObject("username","zhangsan");
modelAndView.setViewName("success");
return modelAndView; //新增代码
}
/*实体类*/
@RequestMapping("/testPojo")
public String testPojo(User user) {
System.out.println(user);
return "success";
}
@RequestMapping("/testParamsRequired")
public String testParamsRequired( @RequestParam (value="username",required=true) String username,Integer age) {
System.out.println("testParamsRequired,username:" + username);
System.out.println("testParamsRequired,age:" + age);
return "success";
}
@RequestMapping("/testParams")
public String testParams(@RequestParam("name") String username,
@RequestParam("pwd") String password) {
System.out.println("username:" + username);
System.out.println("password:" + password);
return "success";
}
@RequestMapping(value= {"/testUrl1","testUrl2"})
public String testUrl() {
System.out.println("testUrl");
return "success";
}
/* method=RequestMethod.POST 限定接收用什么方式的请求*/
@RequestMapping(value="/testMethod",method=RequestMethod.GET)
public String testMethod() {
System.out.print("testMethod...");
return "success";
}
/*既可以用在方法上，也可以用在类上，这是方法*/
@RequestMapping("/testRequestMapping")
public String testRequestMapping() {
System.out.println("testRequestMapping...");
return "success";
}
}index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Hello Index
Hello testRequestMapping
Hello testMethod
Hello testUrl1
Hello testUrl2
Hello testParams
Hello testParamsRequired
Hello testReturnData //新增代码
success.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
Insert title here
Success page
当前日期：${requestScope.date} //新增代码
用户名：${requestScope.username}
输出：点击按钮---返回当前日期
第二种方式：返回一个ModelAndView
2.在springMVC的参数中可以直接使用的有：
HttpServletRequest
HttpServletResponse
HttpSession
Map
Model
修改代码：SpringmvcTest.java
package com.neuedu.springmvc.controller;
import java.util.Date;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.neuedu.springmvc.po.User;
import com.sun.javafx.scene.accessibility.Attribute;
import com.sun.org.apache.bcel.internal.generic.NEW;
@Controller
//@RequestMapping("/test")
/*这是类*/
public class SpringmvcTest {
/*向前台传递数据的第二种方式： //新增代码
2.在springMVC的参数中可以直接使用的有：
HttpServletRequest
HttpServletResponse
HttpSession
Map
Model //新增代码
*/
@RequestMapping("/testReturnData2")
public String testReturnData2(Map map) {
User user = new User("li", "1234", "female", "[email protected]", "15603320164");
map.put("username","zhang2");
map.put("user", user);
return "success";
}
/*向前台传递数据的第一种方式：
1.返回一个ModelAndView*/
@RequestMapping("/testReturnData")
public ModelAndView testReturnData() {
ModelAndView modelAndView= new ModelAndView();
modelAndView.addObject("date", new Date());
modelAndView.addObject("username","zhangsan");
modelAndView.setViewName("success");
return modelAndView;
}
/*实体类*/
@RequestMapping("/testPojo")
public String testPojo(User user) {
System.out.println(user);
return "success";
}
@RequestMapping("/testParamsRequired")
public String testParamsRequired( @RequestParam (value="username",required=true) String username,Integer age) {
System.out.println("testParamsRequired,username:" + username);
System.out.println("testParamsRequired,age:" + age);
return "success";
}
@RequestMapping("/testParams")
public String testParams(@RequestParam("name") String username,
@RequestParam("pwd") String password) {
System.out.println("username:" + username);
System.out.println("password:" + password);
return "success";
}
@RequestMapping(value= {"/testUrl1","testUrl2"})
public String testUrl() {
System.out.println("testUrl");
return "success";
}
/* method=RequestMethod.POST 限定接收用什么方式的请求*/
@RequestMapping(value="/testMethod",method=RequestMethod.GET)
public String testMethod() {
System.out.print("testMethod...");
return "success";
}
/*既可以用在方法上，也可以用在类上，这是方法*/
@RequestMapping("/testRequestMapping")
public String testRequestMapping() {
System.out.println("testRequestMapping...");
return "success";
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Hello Index
Hello testRequestMapping
Hello testMethod
Hello testUrl1
Hello testUrl2
Hello testParams
Hello testParamsRequired
Hello testReturnData
Hello testReturnData2 //新增代码
success.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
Insert title here
Success page
当前日期：${requestScope.date}
用户名：${requestScope.username}
user：${requestScope.user.password}
用户名：${requestScope.username}
输出：
第三种方式：返回一个Model
修改代码：SpringmvcTest.java
package com.neuedu.springmvc.controller;
import java.util.Date;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.neuedu.springmvc.po.User;
import com.sun.javafx.scene.accessibility.Attribute;
import com.sun.org.apache.bcel.internal.generic.NEW;
@Controller
//@RequestMapping("/test")
/*这是类*/
public class SpringmvcTest { //新增代码
@RequestMapping("/testReturnData3")
public String testReturnData3(User user,Model model) {
model.addAttribute("user",user);
return "success";
} //新增代码
/*向前台传递数据的第二种方式：
2.在springMVC的参数中可以直接使用的有：
HttpServletRequest
HttpServletResponse
HttpSession
Map
Model
*/
@RequestMapping("/testReturnData2")
public String testReturnData2(Map map) {
User user = new User("li", "1234", "female", "[email protected]", "15603320164");
map.put("username","zhang2");
map.put("user", user);
return "success";
}
/*向前台传递数据的第一种方式：
1.返回一个ModelAndView*/
@RequestMapping("/testReturnData")
public ModelAndView testReturnData() {
ModelAndView modelAndView= new ModelAndView();
modelAndView.addObject("date", new Date());
modelAndView.addObject("username","zhangsan");
modelAndView.setViewName("success");
return modelAndView;
}
/*实体类*/
@RequestMapping("/testPojo")
public String testPojo(User user) {
System.out.println(user);
return "success";
}
@RequestMapping("/testParamsRequired")
public String testParamsRequired( @RequestParam (value="username",required=true) String username,Integer age) {
System.out.println("testParamsRequired,username:" + username);
System.out.println("testParamsRequired,age:" + age);
return "success";
}
@RequestMapping("/testParams")
public String testParams(@RequestParam("name") String username,
@RequestParam("pwd") String password) {
System.out.println("username:" + username);
System.out.println("password:" + password);
return "success";
}
@RequestMapping(value= {"/testUrl1","testUrl2"})
public String testUrl() {
System.out.println("testUrl");
return "success";
}
/* method=RequestMethod.POST 限定接收用什么方式的请求*/
@RequestMapping(value="/testMethod",method=RequestMethod.GET)
public String testMethod() {
System.out.print("testMethod...");
return "success";
}
/*既可以用在方法上，也可以用在类上，这是方法*/
@RequestMapping("/testRequestMapping")
public String testRequestMapping() {
System.out.println("testRequestMapping...");
return "success";
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Hello Index
Hello testRequestMapping
Hello testMethod
Hello testUrl1
Hello testUrl2
Hello testParams
Hello testParamsRequired
Hello testReturnData
Hello testReturnData2
//新增代码
输出：
第四种方式：返回一个Request
修改代码：SpringmvcTest.java
package com.neuedu.springmvc.controller;
import java.util.Date;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.neuedu.springmvc.po.User;
import com.sun.javafx.scene.accessibility.Attribute;
import com.sun.org.apache.bcel.internal.generic.NEW;
@Controller
//@RequestMapping("/test")
/*这是类*/
public class SpringmvcTest { //新增代码
@RequestMapping("/testReturnData4")
public String testReturnData4(User user,HttpServletRequest request){
request.setAttribute("user",user);
return "success";
} //新增代码
@RequestMapping("/testReturnData3")
public String testReturnData3(User user,Model model) {
model.addAttribute("user",user);
return "success";
}
/*向前台传递数据的第二种方式：
2.在springMVC的参数中可以直接使用的有：
HttpServletRequest
HttpServletResponse
HttpSession
Map
Model
*/
@RequestMapping("/testReturnData2")
public String testReturnData2(Map map) {
User user = new User("li", "1234", "female", "[email protected]", "15603320164");
map.put("username","zhang2");
map.put("user", user);
return "success";
}
/*向前台传递数据的第一种方式：
1.返回一个ModelAndView*/
@RequestMapping("/testReturnData")
public ModelAndView testReturnData() {
ModelAndView modelAndView= new ModelAndView();
modelAndView.addObject("date", new Date());
modelAndView.addObject("username","zhangsan");
modelAndView.setViewName("success");
return modelAndView;
}
/*实体类*/
@RequestMapping("/testPojo")
public String testPojo(User user) {
System.out.println(user);
return "success";
}
@RequestMapping("/testParamsRequired")
public String testParamsRequired( @RequestParam (value="username",required=true) String username,Integer age) {
System.out.println("testParamsRequired,username:" + username);
System.out.println("testParamsRequired,age:" + age);
return "success";
}
@RequestMapping("/testParams")
public String testParams(@RequestParam("name") String username,
@RequestParam("pwd") String password) {
System.out.println("username:" + username);
System.out.println("password:" + password);
return "success";
}
@RequestMapping(value= {"/testUrl1","testUrl2"})
public String testUrl() {
System.out.println("testUrl");
return "success";
}
/* method=RequestMethod.POST 限定接收用什么方式的请求*/
@RequestMapping(value="/testMethod",method=RequestMethod.GET)
public String testMethod() {
System.out.print("testMethod...");
return "success";
}
/*既可以用在方法上，也可以用在类上，这是方法*/
@RequestMapping("/testRequestMapping")
public String testRequestMapping() {
System.out.println("testRequestMapping...");
return "success";
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Hello Index
Hello testRequestMapping
Hello testMethod
Hello testUrl1
Hello testUrl2
Hello testParams
Hello testParamsRequired
Hello testReturnData
Hello testReturnData2
//修改代码
输出：
