第一步,對request請求進行增強:

/*** author: zhangxueliang* date: 2019-08-23*/ public class ParameterServletRequestWrapper extends HttpServletRequestWrapper {private Map<String , String[]> params = new HashMap<String, String[]>();public ParameterServletRequestWrapper(HttpServletRequest request) throws IOException {super(request);this.params.putAll(request.getParameterMap());}/*** 重載一個構造方法* @param request* @param extendParams*/public ParameterServletRequestWrapper(HttpServletRequest request , Map<String , String[]> extendParams) throws IOException {this(request);addAllParameters(extendParams);}@Overridepublic String getParameter(String name) {String[]values = params.get(name);if(values == null || values.length == 0) {return null;}return values[0];}@Overridepublic String[] getParameterValues(String name) {return params.get(name);}public void addAllParameters(Map<String , String[]>otherParams) {for(Map.Entry<String , String[]>entry : otherParams.entrySet()) {addParameter(entry.getKey() , entry.getValue());}}public void addParameter(String name , Object value) {if(value != null) {if(value instanceof String[]) {params.put(name , (String[])value);}else if(value instanceof String) {params.put(name , new String[] {(String)value});}else {params.put(name , new String[] {String.valueOf(value)});}}} }

第二步,編寫Filter過濾器,不可使用攔截器.因為過濾器可以繼續向后傳遞修改后的request,攔截器不能實現。

/*** author: zhangxueliang* date: 2019-08-23*/ @WebFilter(urlPatterns = "/v11/account/*")//如果這里寫@Compnent就是攔截所有請求 public class HttpServletFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {Map<String, String[]> m = new HashMap<String, String[]>(request.getParameterMap());if ("".equals(request.getParameter("cooperationCompanyId"))){m.put("cooperationCompanyId", new String[]{"-1"});}ParameterServletRequestWrapper parameterRequestWrapper = new ParameterServletRequestWrapper((HttpServletRequest) request, m);//繼續向后傳遞修改后的request,攔截器不能實現。chain.doFilter(parameterRequestWrapper, response);}@Overridepublic void destroy() {} }

效果:

總結

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