spring mvc框架中的参数传递

男娘i 2022-05-24 07:56 190阅读 0赞

### spring mvc框架中的参数传递 ###

#### 页面传递参数给controller ####

1.  查询参数

url示例: /spittles?max=238900&count=50

@RequestMapping(method=GET)
    public String spittles(
        @RequestParam(defaultValue="20") int max, 
        @RequestParam(defaultValue="3") int count) {
    
        return "spittle";  // it would refer WEB-INF/views/spittle.jsp
    }

1.  表单传递

表单使用post发送请求

@RequestMapping(method=POST)
    public String spittles(@RequestBody Spittle s) {
        return "spittle";
    }

1.  路径变量

url示例: /spittles/1234567

@RequestMapping(value="/{spittleId}", method=GET)
    public String spittles(
        @PathVariable int spittleId) {
            return "spittle";
        }

#### controller传递参数给view ####

Controller传递参数给view, 需要在controller入参指定org.springframework.ui.Model，然后把传递的参数放进去  
`model.addAttribute("srList", srList);`

在jsp中，调用参数格式如下:

<c:forEach items="${srList}" var="spittle">
          <c:out value="${spittle.username}"></c:out>
          <c:out value="${spittle.age}"></c:out>
        </c:forEach>

代码如下  
SpittleController.java

package spittr.web;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    
    import java.util.*;
    
    import static org.springframework.web.bind.annotation.RequestMethod.GET;
    
    /** * Created by Administrator on 2017/6/6. */
    @Controller
    @RequestMapping(value="/spittles")
    public class SpittleController { 
        @RequestMapping(method = GET)
        public String spittles(Model model,
                               @RequestParam(defaultValue = "123") String u1) {
            List<SpittlesRep> srList = new ArrayList<SpittlesRep>();
            String uu = new String();
            System.out.println("get u1" + u1);
            SpittlesRep sr = new SpittlesRep();
            sr.setUsername("robin");
            sr.setAge(13);
            srList.add(sr);
            uu = "Hello";
            model.addAttribute("srList", srList);
            model.addAttribute("uu", uu);
            return "spittles";
        }
    }

spittles.jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
    <%@ page session="false" %>
    
    <html>
      <head>
        <title>Spittles</title>
        <link rel="stylesheet" type="text/css" href="<c:url value='/resources/style.css' />" >
      </head>
      <body>
        <h1>Welcome to Spittles</h1>
        <c:forEach items="${srList}" var="spittle">
          <c:out value="${spittle.username}"></c:out>
          <c:out value="${spittle.age}"></c:out>
        </c:forEach>
      <c:out value="${uu}">123</c:out>
      <c:out value="${u1}"></c:out>
      </body>
    </html>