8.1 配置
- Spring MVC的配置是通过继承
WebMvcConfigurerAdapter类并重载其方法实现的; - 前几个教程已做了得配置包括
- 01点睛Spring MVC 4.1-搭建环境 配置viewResolver
- 03点睛Spring MVC 4.1-REST 静态资源映射
- 04点睛Spring MVC 4.1-拦截器 配置拦截器
- 06点睛Spring MVC 4.1-文件上传 配置multipartResolver
- 07点睛Spring MVC4.1-ContentNegotiatingViewResolver 配置ContentNegotiatingViewResolver
8.2 演示
8.2.1 配置路径匹配参数
-
在Spring MVC中路径参数如果带
.的话,.后面的值将被忽略,本例演示配置configurePathMatch不忽略点后面的参数; -
演示控制器
@RequestMapping("/configPath/{test}")
public @ResponseBody String configPath(@PathVariable String test){
return "request value:"+test;
}
- 运行:访问http://localhost:8080/testSpringMVC/configPath/xx.yy
- 在继承
WebMvcConfigurerAdapter的DemoMVCConfig类中重载configurePathMatch
@Override
public void configurePathMatch(PathMatchConfigurer configurer) {
configurer.setUseSuffixPatternMatch(false);
}
- 再次运行:访问访问http://localhost:8080/testSpringMVC/configPath/xx.yy
8.2.2 快捷定义ViewController
- 我们经常涉及到页面转向,但没任何处理业务的时候,快捷的页面转向定义会节省好多代码;
- 在views目录下建一个任意的
test.jsp - 常规的方案是这样写的
@RequestMapping("/mytest")
public String test(){
return "test";
}
- 在继承
WebMvcConfigurerAdapter的DemoMVCConfig类中重载addViewControllers
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/mytest").setViewName("/test");
//添加更多
}
- 以上效果等同,均会指向views下的test.jsp
8.2.3 配置HttpMessageConverter
-
HttpMessageConverter是对http的request和response进行自动转换 -
配置
HttpMessageConverter可重载下面两个方法任意一个-
configureMessageConverters:重载会覆盖掉spring mvc默认注册的多个HttpMessageConverter -
extendMessageConverters:仅添加一个自定义的HttpMessageConverter,不覆盖默认注册的HttpMessageConverter
-
-
通过对上面的讲述,我们一般是重载
extendMessageConverters方法; -
下面我们演示使用js向spring mvc发送自定义格式的字符串(属性用-隔开),通过自定义的
HttpMessageConverter自动转换成对象,然后通过HttpMessageConverter输出指定格式到浏览器 -
测试javabean
- Person
package com.wisely.domain;
public class Person {
private String firstName;
private String lastName;
public Person(String firstName, String lastName) {
super();
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
- 自定义
HttpMessageConverter：WiselyMessageConverter
package com.wisely.converters;
import java.io.IOException;
import java.nio.charset.Charset;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.util.StreamUtils;
import com.wisely.domain.Person;
public class WiselyMessageConverter extends AbstractHttpMessageConverter<Person> {
//自定义媒体类型
public WiselyMessageConverter(){
super(new MediaType("application", "x-wisely", Charset.forName("UTF-8")));
}
//从request里获得构造Person实例的数据
@Override
protected Person readInternal(ClassPerson> clazz,
HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException {
String temp = StreamUtils.copyToString(inputMessage.getBody(),
Charset.forName("UTF-8"));
String[] tempArr = temp.split("-");
return new Person(tempArr[0],tempArr[1]);
}
//只支持Person类
@Override
protected boolean supports(Class clazz) {
return Person.class.isAssignableFrom(clazz);
}
//将person实例转换成你想要的字符串格式
@Override
protected void writeInternal(Person person, HttpOutputMessage outputMessage)
throws IOException, HttpMessageNotWritableException {
String out = "hello:" +person.getFirstName() + "-" + person.getLastName();
outputMessage.getBody().write(out.getBytes());
}
}
- 配置
WiselyMessageConverter
@Override
public void extendMessageConverters(List<HttpMessageConverter> converters) {
WiselyMessageConverter converter = new WiselyMessageConverter();
converters.add(converter);
}
注释掉上例的configureContentNegotiation,这里会自动将媒体类型变为text/html
// 配置ContentNegotiationManager,在无后缀名情况下默认为jsp view resolver
// @Override
// public void configureContentNegotiation(
// ContentNegotiationConfigurer configurer) {
// //忽略请求的header信息,并将contentType置为text/html
// configurer.ignoreAcceptHeader(true).defaultContentType(
// MediaType.TEXT_HTML);
// }
- 测试控制器
@RequestMapping(value = "/convert", produces = { "application/x-wisely" })
public @ResponseBody Person convert(@RequestBody Person person) {
return person;
}
- 测试页面：test.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<div id="resp"></div><input type="button" onclick="req();" value="请求"/>
<script src="js/jquery.js" type="text/javascript"></script>
<script>
function req(){
$.ajax({
url: "convert",
data: "wang-yunfei",//注意此处的格式
type:"POST",
contentType:"application/x-wisely",
success: function(data){
$("#resp").html(data);
}
});
}
</script>
</body>
</html>
- 运行效果
新书推荐《JavaEE开发的颠覆者: Spring Boot实战》，涵盖Spring 4.x、Spring MVC 4.x、Spring Boot企业开发实战。
京东地址：http://item.jd.com/11894632.html
当当地址：http://product.dangdang.com/23926195.html
亚马逊地址：http://www.amazon.cn/图书/dp/B01D5ZBFUK/ref=zg_bsnr_663834051_6
淘宝地址:https://item.taobao.com/item.htm?id=528426235744&ns=1&abbucket=8#detail
或自己在京东、淘宝、亚马逊、当当、互动出版社搜索自选。
