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struts2下载中文在IE firefox下乱码问题

// 判断浏览器 

        HttpServletRequest request = ServletActionContext.getRequest(); 

        String Agent = request.getHeader("User-Agent"); 

        if (null != Agent) { 

            Agent = Agent.toLowerCase(); 

            if (Agent.indexOf("firefox") != -1) { 

                filename = new String(doc.getSubject().getBytes(),"iso8859-1"); 

            } else if (Agent.indexOf("msie") != -1) { 

                filename = java.net.URLEncoder.encode(doc.getSubject(),"UTF-8"); 

            } else { 

                filename = java.net.URLEncoder.encode(doc.getSubject(),"UTF-8"); 

            } 

        }

//乱码出现的原因     

ie采用URLEncoder编码输出中文     

opera采用filename     

safari采用iso-8859-1     

chrome采用base64或iso-8859-1     

firefox采用base64或iso-8859-1

struts2下载中文在IE firefox下乱码问题