修复bug，解决重复提交问题

src/main/java/com/bwie/Filter/XssFilter.java

@@ -0,0 +1,35 @@
+package com.bwie.Filter;
+
+import com.bwie.config.XssHttpServletRequestWrapper;
+
+import javax.servlet.*;
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+
+public class XssFilter implements Filter {
+    @Override
+    public void init(FilterConfig filterConfig) throws ServletException {
+
+    }
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+        ServletRequest requestWrapper = null;
+        if(request instanceof HttpServletRequest) {
+            requestWrapper = new XssHttpServletRequestWrapper((HttpServletRequest) request);
+        }
+        //获取请求中的流如何，将取出来的字符串，再次转换成流，然后把它放入到新request对象中。
+        // 在chain.doFiler方法中传递新的request对象
+        if(requestWrapper == null) {
+
+       chain.doFilter(request, response);
+        } else {
+            chain.doFilter(requestWrapper, response);
+        }
+    }
+
+    @Override
+    public void destroy() {
+
+    }
+}

src/main/java/com/bwie/config/XssHttpServletRequestWrapper.java

@@ -0,0 +1,57 @@
+package com.bwie.config;
+
+import javax.servlet.ReadListener;
+import javax.servlet.ServletInputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
+    public String _body;
+
+    public XssHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
+        super(request);
+        StringBuffer sBuffer = new StringBuffer();
+        BufferedReader bufferedReader = request.getReader();
+        String line;
+        while ((line = bufferedReader.readLine()) != null) {
+            sBuffer.append(line);
+        }
+        _body = sBuffer.toString();
+
+    }
+
+    @Override
+    public ServletInputStream getInputStream() {
+        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(_body.getBytes());
+        return new ServletInputStream() {
+            @Override
+            public int read() {
+                return byteArrayInputStream.read();
+            }
+
+            @Override
+            public boolean isFinished() {
+                return false;
+            }
+
+            @Override
+            public boolean isReady() {
+                return false;
+            }
+
+            @Override
+            public void setReadListener(ReadListener listener) {
+
+            }
+        };
+    }
+
+    @Override
+    public BufferedReader getReader() {
+        return new BufferedReader(new InputStreamReader(this.getInputStream()));
+    }
+}

src/main/java/com/bwie/utils/HttpServletRequestReader.java

@@ -0,0 +1,35 @@
+package com.bwie.utils;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.BufferedReader;
+import java.io.IOException;
+
+public class HttpServletRequestReader {
+
+    // 字符串读取
+    // 方法一
+    public static String ReadAsChars(HttpServletRequest request) {
+
+        BufferedReader br = null;
+        StringBuilder sb = new StringBuilder("");
+        try {
+            br = request.getReader();
+            String str;
+            while ((str = br.readLine()) != null) {
+                sb.append(str);
+            }
+            br.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (null != br) {
+                try {
+                    br.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return sb.toString();
+    }
+}