在FileUpload一文中，我们初步了解了SpringMVC中View的用法，在例子中，通过给Model添加一个属性（model.addAttribute()），View对应的JSP就可以获取该值。本文再介绍一些View对应JSP取值的方式。
增加一个Controller，ViewsController：
package org.springframework.samples.mvc.views;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
@RequestMapping("/views/*")
public class ViewsController {
@RequestMapping(value="html", method=RequestMethod.GET)
public String prepare(Model model) {
model.addAttribute("foo", "bar");
model.addAttribute("fruit", "apple");
return "views/html";
}
@RequestMapping(value="/viewName", method=RequestMethod.GET)
public void usingRequestToViewNameTranslator(Model model) {
model.addAttribute("foo", "bar");
model.addAttribute("fruit", "apple");
}
@RequestMapping(value="pathVariables/{foo}/{fruit}", method=RequestMethod.GET)
public String pathVars(@PathVariable String foo, @PathVariable String fruit) {
// No need to add @PathVariables "foo" and "fruit" to the model
// They will be merged in the model before rendering
return "views/html";
}
@RequestMapping(value="dataBinding/{foo}/{fruit}", method=RequestMethod.GET)
public String dataBinding(@Valid JavaBean javaBean, Model model) {
// JavaBean "foo" and "fruit" properties populated from URI variables
return "views/dataBinding";
}
}
1. 访问"http://localhost:8080/web/views/html"，返回到"webapp/WEB-INF/views/views/html.jsp"：
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>My HTML View</title>
<link href="<c:url value="/resources/form.css" />" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="success">
<h3>foo: "${foo}"</h3>
<h3>fruit: "${fruit}"</h3>
</div>
</body>
</html>
prepare(Model model)同FileUpload一样，通过model.addAttribite("foo", "bar");，JSP的${foo}就能获得"bar"。
2. 访问"http://localhost:8080/web/views/viewName"，返回到"webapp/WEB-INF/views/views/viewName.jsp"，这个jsp文件和html.jsp一样。
usingRequestToViewNameTranslator(Model model)和prepare(Model model)稍有不同，该方法的返回值为void，SpringMVC认为返回值为void的View名字就是@RequestMapping中映射的完整路径，即"views/viewName"。
3. 访问"http://localhost:8080/web/views/pathVariables/bar/orange"，返回到"webapp/WEB-INF/views/views/html.jsp"
pathVars方法多了@PathVariable注解，该注解解析URL路径，并赋值给带有@PathVaribale的变量，View对应的JSP可以直接读取到这个变量的值。
4. 访问"http://localhost:8080/web/views/dataBinding/bar/orange"，返回到"webapp/WEB-INF/views/views/dataBinding.jsp"
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page session="false" %>
<html>
<head>
<title>Data Binding with URI Template Variables</title>
<link href="<c:url value="/resources/form.css" />" rel="stylesheet" type="text/css" />
</head>
<body>
<div class="success">
<h3>javaBean.foo: ${javaBean.foo}</h3>
<h3>javaBean.fruit: ${javaBean.fruit}</h3>
</div>
</body>
</html>
dataBinding(@Valid JavaBean javaBean, Model model)的方法参数中有个自定义的Java类，SpringMVC会自动解析URL路径，并且感知foo和fruit是否为JavaBean的属性，如果是，则将它赋值给JavaBean，非常智能。JSP现在得到的就是一个JavaBean，因此需要使用${javaBean.foo}获取具体值。
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