JSONP请求控制

Web.xml中配置Filter

<!-- JSONP请求控制 --><filter>       <filter-name>jsonpFilter</filter-name>       <filter-class>JsonpFilter路径</filter-class>       <async-supported>true</async-supported>   </filter>    <filter-mapping>       <filter-name>jsonpFilter</filter-name>       <url-pattern>/*</url-pattern>    </filter-mapping>

编写jsonpFilter

import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.PrintWriter;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletOutputStream;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.WriteListener;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpServletResponseWrapper;import net.sf.json.JSONException;import net.sf.json.JSONObject;import org.springframework.http.HttpStatus;public final class JsonpFilter implements Filter {public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,ServletException {if (request.getParameter("callback") != null) {ByteResponseWrapper brw = new ByteResponseWrapper((HttpServletResponse) response);chain.doFilter(request, brw);String out = new String(brw.getBytes());Map<String, Object> map = null;try {map = JsonTool.getMap4Json(out);} catch (JSONException ex) {}if (map != null) {((HttpServletResponse) response).setStatus(HttpStatus.OK.value());int status = brw.getStatus();if (status >= 200 && status < 300 || status == 304) {if (status == 304) {((HttpServletResponse) response).setStatus(HttpStatus.NOT_MODIFIED.value());}map.put("status", "success");} else {map.put("status", "error");}out = JSONObject.fromObject(map).toString();}out = request.getParameter("callback") + "(" + out;out += ")";response.setContentType("application/json; charset=utf-8");response.setContentLength(out.getBytes().length);response.getOutputStream().write(out.getBytes());} else {chain.doFilter(request, response);}}public void destroy() {}public void init(FilterConfig filterConfig) {}static class ByteResponseWrapper extends HttpServletResponseWrapper {private PrintWriter writer;private ByteOutputStream output;private int code = 200;public byte[] getBytes() {writer.flush();return output.getBytes();}public ByteResponseWrapper(HttpServletResponse response) {super(response);output = new ByteOutputStream();writer = new PrintWriter(output);}@Overridepublic PrintWriter getWriter() {return writer;}@Overridepublic ServletOutputStream getOutputStream() throws IOException {return output;}public int getStatus() {return code;}    public void sendRedirect(String location) throws IOException {    code = HttpStatus.MOVED_TEMPORARILY.value();    super.sendRedirect(location);    }@Overridepublic void setStatus(int sc) {this.code = sc;}@Overridepublic void setStatus(int sc, String message) {this.code = sc;}@Overridepublic void sendError(int sc) throws IOException {this.code = sc;}@Overridepublic void sendError(int sc, String msg) throws IOException {this.code = sc;}}static class ByteOutputStream extends ServletOutputStream {private ByteArrayOutputStream bos = new ByteArrayOutputStream();@Overridepublic void write(int b) throws IOException {bos.write(b);}public byte[] getBytes() {return bos.toByteArray();}@Overridepublic boolean isReady() {return false;}@Overridepublic void setWriteListener(WriteListener arg0) {}}private static class JsonTool {public static Map getMap4Json(String jsonString) {JSONObject jsonObject = JSONObject.fromObject(jsonString);Iterator keyIter = jsonObject.keys();String key;Object value;Map valueMap = new HashMap();while (keyIter.hasNext()) {key = (String) keyIter.next();value = jsonObject.get(key);valueMap.put(key, value);}return valueMap;}}}