springmvc 开涛 生产者/消费者

媒体类型：

text/html, text/plain, text/xml
image/gif, image/jpg, image/png
application/x-www-form-urlencodeed, application/json, application/xml  有q参数，q参数为媒体类型的质量因子，越大则优先权越高(从0到1)
multipart/form-data

内容类型：Content-Type:MIME  有charset参数

服务器端有header， 客户端有Accept，扩展名，参数-ContentNegotiatingViewResolver（简单方法）

spring3.1通过consume和product来限定

窄化时是覆盖而非继承，其他（header，param）是继承

服务器端header详解

1、form get

@RequestMapping("/content")
public ModelAndView showForm(@ModelAttribute("user") User user){
	ModelAndView mv = new ModelAndView();		
	mv.setViewName("hello");
	return mv;
}

2、form post x

@RequestMapping(value="/content", method=RequestMethod.POST, headers="Content-Type=application/x-www-form-urlencoded")
public ModelAndView request1(HttpServletRequest request){		
	//System.out.println("/content post");
	
	String contentType=request.getContentType();
	System.out.println("contentType:"+contentType);
	
	String characterEncoding=request.getCharacterEncoding();
	System.out.println("characterEncoding:"+characterEncoding);		
	
	System.out.println(request.getParameter("c"));
	
	ModelAndView mv = new ModelAndView();		
	mv.setViewName("success");
	return mv;
}

3、form post json

@RequestMapping(value="/content", method=RequestMethod.POST, headers="Content-Type=application/json")
public void request2(HttpServletRequest request, HttpServletResponse response) throws IOException{
	System.out.println("/json content post");
	System.out.println("charset:"+request.getCharacterEncoding());
	
	InputStream is = request.getInputStream();
	byte bytes[] = new byte[request.getContentLength()];
	is.read(bytes);		
	
	String jsonStr = new String(bytes, request.getCharacterEncoding());
	System.out.println("json data:"+jsonStr);		
	
	ModelAndView mv = new ModelAndView();		
	mv.setViewName("success");
	return mv;	
	
}

4、form post x ClientHttpRequest

@RequestMapping(value="/content", method=RequestMethod.POST, headers="Content-Type=application/x-www-form-urlencoded")
public void request(HttpServletResponse response) throws IOException, URISyntaxException{
	System.out.println("/x content post");
	
	String url = "http://localhost:8080/springmvc/content";
	ClientHttpRequest request = new SimpleClientHttpRequestFactory().createRequest(new URI(url), HttpMethod.POST);
	request.getHeaders().set("Content-Type", "application/json;charset=gbk");
	String jsonData = "{"username":"zhang"}";
	request.getBody().write(jsonData.getBytes("gbk"));
	request.execute();
	System.out.println("status:"+response.getStatus());	
	
	response.setContentType("text/html;charset=utf-8");
	response.getWriter().write("json response");	
	
}

1-2正常情况

1-3没法设置json，所以1-4-3-4

2注释掉，因为get想直接到post x

ClientHttpRequest与真正的HttpServletResponse不同，有些方法不太一样。

客户端Accept

不太了解，client的方法

private static void jsonRequest() throws IOException, URISyntaxException {
    //请求的地址
    String url = "http://localhost:9080/springmvc-chapter6/response/ContentType";
    //①创建Http Request(内部使用HttpURLConnection)
    ClientHttpRequest request = 
        new SimpleClientHttpRequestFactory().   
            createRequest(new URI(url), HttpMethod.POST);
    //②设置客户端可接受的媒体类型（即需要什么类型的响应体数据）
    request.getHeaders().set("Accept", "application/json");        
    //③发送请求并得到响应
    ClientHttpResponse response = request.execute();
    //④得到响应体的编码方式
    Charset charset = response.getHeaders().getContentType().getCharSet();        
    //⑤得到响应体的内容        
    InputStream is = response.getBody();
    byte bytes[] = new byte[(int)response.getHeaders().getContentLength()];
    is.read(bytes);
    String jsonData = new String(bytes, charset);
    System.out.println("charset : " + charset + ", json data : " + jsonData);
}

spring3.1

需要添加的bean

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

consumes = {application/json};
produces = {application/json}

总结：有些方法不太熟练

HttpServletRequest req
req.getContentType();
req.getCharacterEncoding();
req.getParameter("c");  //form name c
req.getContentLength();

HttpServletResponse res
res.setContentType("text/html;charset=utf-8");
res.getWriter().write("json response");

ClientHttpRequest req
req.getHeaders().set("Content-Type", "application/json;charset=gbk");
req.getBody().write(jsonData.getBytes("gbk"));
req.execute();