java防止页面脚本注入 特殊字符过滤器

转载自：http://yuncode.net/code/c_54a003069e20d32

Step1:自定义封装request

package com.tsou.comm.servlet;

import java.util.Enumeration;

import java.util.Map;

import java.util.Vector;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

/**

*

*

* 功能：封装的请求处理特殊字符

*

* @ClassName: TsRequest

* @version V1.0

* @date 2014年9月25日

* @author wangsheng

*/

public class TsRequest extends HttpServletRequestWrapper {

private Map params;

public TsRequest(HttpServletRequest request, Map newParams) {

super(request);

this.params = newParams;

}

public Map getParameterMap() {

return params ;

}

public Enumeration getParameterNames() {

Vector l = new Vector( params.keySet());

return l.elements();

}

public String[] getParameterValues(String name) {

Object v = params.get(name);

if (v == null ) {

return null ;

} else if (v instanceof String[]) {

String[] value = (String[]) v;

for (int i = 0; i < value.length; i++) {

value[i] = value[i].replaceAll( "<", "<" );

value[i] = value[i].replaceAll( ">", ">" );

}

return (String[]) value;

} else if (v instanceof String) {

String value = (String) v;

value = value.replaceAll( "<", "<" );

value = value.replaceAll( ">", ">" );

return new String[] { (String) value };

} else {

return new String[] { v.toString() };

}

}

public String getParameter(String name) {

Object v = params.get(name);

if (v == null ) {

return null ;

} else if (v instanceof String[]) {

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

if (strArr.length > 0) {

String value = strArr[0];

value = value.replaceAll( "<", "<" );

value = value.replaceAll( "<", ">" );

return value;

} else {

return null ;

}

} else if (v instanceof String) {

String value = (String) v;

value = value.replaceAll( "<", "<" );

value = value.replaceAll( ">", ">" );

return (String) value;

} else {

return v.toString();

}

}

}

Step2:设置过滤器

package com.tsou.comm.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import com.tsou.comm.servlet.TsRequest;

/**

*

*

* 功能：特殊字符过滤器

*

* @ClassName: CharacterFilter

* @version V1.0

* @date 2014年9月25日

* @author wangsheng

*/

public class CharacterFilter implements Filter{

@Override

public void destroy() {

}

@Override

public void doFilter(ServletRequest req, ServletResponse res,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest request = (HttpServletRequest)req;

TsRequest wrapRequest= new TsRequest(request,request.getParameterMap());

chain.doFilter(wrapRequest, res);

}

@Override

public void init(FilterConfig arg0) throws ServletException {

}

}

Step3:拦截URL

characterFilter

class> com.tsou.comm.filter.CharacterFilterclass >

characterFilter

/*