Java 如何在Spring MVC REST for JSON中设置内容长度?
我有一些代码:Java 如何在Spring MVC REST for JSON中设置内容长度?,java,json,spring,spring-mvc,content-length,Java,Json,Spring,Spring Mvc,Content Length,我有一些代码: @RequestMapping(value = "/products/get", method = RequestMethod.GET) public @ResponseBody List<Product> getProducts(@RequestParam(required = true, value = "category_id") Long categoryId) { // some code here return new ArrayList&
@RequestMapping(value = "/products/get", method = RequestMethod.GET)
public @ResponseBody List<Product> getProducts(@RequestParam(required = true, value = "category_id") Long categoryId) {
// some code here
return new ArrayList<>();
}
@RequestMapping(value=“/products/get”,method=RequestMethod.get)
public@ResponseBody List getProducts(@RequestParam(required=true,value=“category\u id”)长类别id){
//这里有一些代码
返回新的ArrayList();
}
默认情况下,如何配置SpringMVC(或MappingJackson2HttpMessageConverter.class)来设置正确的标题内容长度?因为现在我的响应头
内容长度等于-1 您可以将ShallowEtagHeaderFilter添加到过滤器链中。下面的代码片段适合我
import java.util.Arrays;
import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.ShallowEtagHeaderFilter;
@Configuration
public class FilterConfig {
@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterBean = new FilterRegistrationBean();
filterBean.setFilter(new ShallowEtagHeaderFilter());
filterBean.setUrlPatterns(Arrays.asList("*"));
return filterBean;
}
}
响应主体将如下所示:
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
X-Application-Context: application:sxp:8090
ETag: "05e7d49208ba5db71c04d5c926f91f382"
Content-Type: application/json;charset=UTF-8
Content-Length: 232
Date: Wed, 16 Dec 2015 06:53:09 GMT
链中的以下过滤器设置内容长度:
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.util.ContentCachingResponseWrapper;
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
ContentCachingResponseWrapper responseWrapper = new ContentCachingResponseWrapper((HttpServletResponse) response);
chain.doFilter(request, responseWrapper);
responseWrapper.copyBodyToResponse();
}
@Override
public void destroy() {
}
}
主要思想是所有内容都缓存在ContentCachingResponseRapper中,最后在调用copyBodyToResponse()时设置内容长度 你可能想看看这个@shazin谢谢。这是一个不错的解决方案。它的工作!)