servlet request参数只能取一次解决方法

落日映苍穹つ 2023-10-11 19:09 58阅读 0赞

package com.g4m.admin.conf;

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.nio.charset.Charset;

import java.util.HashMap;

import java.util.Map;

import javax.servlet.ReadListener;

import javax.servlet.ServletInputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

import org.apache.commons.io.IOUtils;

public class HttpRequestWrapper extends HttpServletRequestWrapper \{

private String body;

private ServletInputStream inputStream;

private BufferedReader reader;

private String requestURI;

private StringBuilder requestURL;

private String servletPath;

private Map params;

public HttpRequestWrapper(HttpServletRequest request) throws IOException \{

super(request);

if (!isMultipart()) \{

preLoadBody(request);

private void preLoadBody(HttpServletRequest request) throws IOException \{

Charset charset = Charset.forName(getCharacterEncoding());

byte\[\] bodyBytes= IOUtils.toByteArray(request.getInputStream());

body =new String(bodyBytes, charset);

inputStream =new RequestCachingInputStream(body.getBytes(getCharacterEncoding()));

public final boolean isMultipart() \{

String contentType = getContentType();

return contentType !=null && contentType.toLowerCase().startsWith("multipart/");

@Override

public final String getContentType() \{

String \_contentType =getParameter("\_contentType");

if (\_contentType !=null) \{

return \_contentType;

return super.getContentType();

public String getBody() \{

if (isMultipart()) \{

throw new IllegalStateException("multipart request does not support preloaded body");

return body;

@Override

public String getMethod() \{

String \_method =getParameter("\_method");

if (\_method !=null) \{

return \_method;

return super.getMethod();

@Override

public ServletInputStream getInputStream() throws IOException \{

if (inputStream !=null) \{

return inputStream;

return super.getInputStream();

@Override

public BufferedReader getReader() throws IOException \{

if (reader==null) \{

reader =new BufferedReader(new InputStreamReader(inputStream, getCharacterEncoding()));

return reader;

@Override

public final String getCharacterEncoding() \{

String defaultEncoding =super.getCharacterEncoding();

return defaultEncoding !=null ? defaultEncoding : "UTF-8";

public void setParams(Map params) \{

this.params= params;

private static class RequestCachingInputStream extends ServletInputStream \{

private final ByteArrayInputStream inputStream;

public RequestCachingInputStream(byte\[\] bytes) \{

inputStream =new ByteArrayInputStream(bytes);

@Override

public int read() throws IOException \{

return inputStream.read();

@Override

public boolean isFinished() \{

return false;

@Override

public boolean isReady() \{

return false;

@Override

public void setReadListener(ReadListener readListener) \{

@Override

public String getRequestURI() \{

if (this.requestURI==null) \{

return super.getRequestURI();

@Override

public StringBuffer getRequestURL() \{

if (this.requestURL==null) \{

return super.getRequestURL();

return new StringBuffer(this.requestURL.toString());

@Override

public String getServletPath() \{

if (servletPath==null) \{

return super.getServletPath();

return this.servletPath;

public void setRequestURI(String requestURI, HttpServletRequest request) \{

this.servletPath= requestURI;

this.requestURI=request.getContextPath() + requestURI;

this.requestURL=new StringBuilder().append(request.getProtocol())

.append("://")

.append(request.getLocalAddr())

.append("/")

.append(servletPath);

@Override

public String\[\] getParameterValues(String name) \{

if (params !=null) \{

Object v = params.get(name);

if (v==null) \{

return null;

\} else if (v instanceof String\[\]) \{

return (String\[\]) v;

\} else if (v instanceof String) \{

return new String\[\]\{(String) v\};

\} else \{

return new String\[\]\{v.toString()\};

return super.getParameterValues(name);

@Override

public String getParameter(String name) \{

if (params !=null) \{

Object v = params.get(name);

if (v==null) \{

return null;

\} else if (v instanceof String\[\]) \{

String\[\] strArr = (String\[\]) v;

if (strArr.length > 0) \{

return strArr\[0\];

\} else \{

return null;

\} else if (v instanceof String) \{

return (String) v;

\} else \{

return v.toString();

return super.getParameter(name);

@Override

public Map getParameterMap() \{

if (params !=null) \{

Map map=new HashMap ();

for (Object key : params.keySet()) \{

Object v = params.get((String) key);

String\[\] strArr =null;

if (v==null) \{

return null;

\} else if (v instanceof String\[\]) \{

strArr = (String\[\]) v;

\} else if (v instanceof String) \{

strArr =new String\[1\];

strArr\[0\]= (String) v;

\} else \{

strArr =new String\[1\];

strArr\[0\]= v.toString();

map.put((String) key, strArr);

return map;

return super.getParameterMap();

servlet request参数只能取一次解决方法

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