今天就跟大家聊聊有關如何在Springmvc中利用ajax實現一個跨域請求，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據這篇文章可以有所收獲。
寫一個類 繼承HandlerInterceptorAdapter
package com.util;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
public class CommonInterceptor extends HandlerInterceptorAdapter {
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods", "*");
response.setHeader("Access-Control-Max-Age", "3600");
response.setHeader("Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept");
response.setHeader("Access-Control-Allow-Credentials", "true"); // 是否允許瀏覽器攜帶用戶身份信息（cookie）
return true;
}
}然后在xml里面配置一下路徑
<mvc:interceptors> <!--過濾所有請求，處理跨域請求問題 --> <mvc:interceptor> <mvc:mapping path="/**" /> <bean class="com.util.CommonInterceptor" /> </mvc:interceptor> </mvc:interceptors>
這樣就可以了 不過有篇博客說針對簡單跨域沒問題。但是針對post＋json請求卻失敗，提示跨域失敗。所以下面記錄一下他的解決方式
建立一個類 繼承 OncePerRequestFilter
public class CrossFilter extends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {
// CORS "pre-flight" request
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
response.addHeader("Access-Control-Allow-Headers", "Content-Type");
response.addHeader("Access-Control-Max-Age", "1800");//30 min
}
filterChain.doFilter(request, response);
}
}web.xml里面設置一下
<filter> <filter-name>cors</filter-name> <filter-class>cn.***.filter.CrossFilter</filter-class> </filter> <filter-mapping> <filter-name>cors</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
然后就可以了 上述方式為spring3.0版本 如果是4.0版本可以用下面方式（無測）
xml里面配置
<mvc:cors>
<mvc:mapping path="/**" allowed-origins="*" allow-credentials="true" max-age="1800" allowed-methods="GET,POST,OPTIONS"/>
</mvc:cors>PS：使用SpringMVC解決Ajax跨域問題
package com.mengyao.system.filter;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
/**
* CORSFilter 解決跨域問題
* @author mengyao
*
*/
@Component
public class InitCORSFilter extends OncePerRequestFilter {
private Logger logger = LoggerFactory.getLogger(InitCORSFilter.class);
public InitCORSFilter() {
logger.info("==== 初始化系統允許跨域請求 ====");
}
/**
* 解決跨域：Access-Control-Allow-Origin，值為*表示服務器端允許任意Domain訪問請求
*/
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
if (request.getHeader("Access-Control-Request-Method") != null && "OPTIONS".equals(request.getMethod())) {
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
response.addHeader("Access-Control-Allow-Headers", "origin, content-type, accept, x-requested-with, sid, mycustom, smuser");
response.addHeader("Access-Control-Max-Age", "1800");//30 min
}
filterChain.doFilter(request, response);
}
}看完上述內容，你們對如何在Springmvc中利用ajax實現一個跨域請求有進一步的了解嗎？如果還想了解更多知識或者相關內容，請關注億速云行業資訊頻道，感謝大家的支持。
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