Spring MVC4.1-Spring MVC的配置(含自定义HttpMessageConverter)

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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(Class<? extends Person> 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