highchart 导出中文问题

/*
* @(#)HighChartsServlet.java	V0.1 2013年10月16日
*
* Copyright 2013 Dreamity Software, Inc. All rights reserved.
* This software is the confidential and proprietary information
* of Dreamity Software, Inc. ("Confidential Information").  You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Dreamity Software, Inc.
*/
package com.nari.slsd.hw.servlet;

/**
* @Package:com.nari.slsd.hw.servlet
* @Title:HighChartsServlet.java
* @Description: TODO
* @Author:terry
* @Date:2013年10月16日下午4:32:15
* @Version:V0.1
*/
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.StringReader;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.batik.transcoder.Transcoder;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.JPEGTranscoder;
import org.apache.batik.transcoder.image.PNGTranscoder;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.fop.svg.PDFTranscoder;

/**
* Servlet implementation class for the batik Transcoder
*/
public class HighChartsServlet extends HttpServlet {

private static final long serialVersionUID = 3920224595120519682L;

public HighChartsServlet() {
super();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");//注意编码
// 先试着通过request.getParameter来获取导出的参数
// 此时请求必须是GET或者POST且Content-Type是application/x-www-form-urlencoded
// 这里无需进行转码, 因为com.highcharts.export.filters.DefaultEncodingFilter已经做了处理
// chrome中Highcharts POST提交的表单Content-Type会是multipart/form-data, 通过request.getParameter是无法获得表单的值(因此此时属于文件上传)
// 这是正常的, 因为modules/exporting.js#exportChart()就是这么设置的enctype: 'multipart/form-data'
// Adding enctype to the exporting post to allow it to work in HTTPS in Firefox. Issue #839.
// https://github.com/highslide-software/highcharts.com/issues/839 // 但是IE中Highcharts POST提交的表单Content-Type会变成application/x-www-form-urlencoded, 又只能通过request.getParameter获得表单的值
// 如果使用ServletFileUpload.parseRequest会直接报错 the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded
// 结果这又是IE的bug, JavaScript动态创建的表单即使设置了enctype为'multipart/form-data'也无济于事, 直接写在HTML中的form元素设置enctype="multipart/form-data"又可以!
// 必须设置encoding为multipart/form-data
String type = request.getParameter("type");
String svg = request.getParameter("svg");
String filename = request.getParameter("filename");
String width = request.getParameter("width");
// chrome中Highcharts POST提交的表单Content-Type会是multipart/form-data, 通过request.getParameter是无法获得表单的值(因此此时属于文件上传)
// 这是正常的, 因为modules/exporting.js#exportChart()就是这么设置的enctype: 'multipart/form-data'
// 对IE采用request.getParameter来获取参数值, chrome采用commons-fileupload来获取表单值
if(svg == null) {
try {
// 通过commons-fileupload来代替servlet 3.0中新的用于文件上传的API(getPart)
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
//判断提交表单的类型是否为multipart/form-data
if(!upload.isMultipartContent(request)) {
return;
}
List<FileItem> items = upload.parseRequest(request);
for(FileItem item : items) {
if(item.isFormField()) {
// Process regular form field (input type="text|radio|checkbox|etc", select, etc).
String fieldName = item.getFieldName();
// 经过fileupload处理过的request中的表单值需要转码, 否则中文会乱码, DefaultEncodingFilter对此无效
String fieldValue = new String(item.getString().getBytes("ISO-8859-1"), "UTF-8");

if("svg".equals(fieldName)) {
svg = fieldValue;
} else if("filename".equals(fieldName)) {
filename = fieldValue;
} else if("width".equals(fieldName)) {
width = fieldValue;
} else if("type".equals(fieldName)) {
type = fieldValue;
}
}
}
} catch(FileUploadException e) {
}
}

ServletOutputStream out = response.getOutputStream();
if(null != type && null != svg) {
// This line is necessary due to a bug in the highcharts SVG generator for IE
// I'm guessing it wont be needed later.
svg = svg.replaceAll(":rect", "rect");
String ext = "";
Transcoder t = null;

if(type.equals("image/png")) {
ext = "png";
t = new PNGTranscoder();

} else if(type.equals("image/jpeg")) {
ext = "jpg";
t = new JPEGTranscoder();

} else if(type.equals("application/pdf")) {
ext = "pdf";
t = new PDFTranscoder();

} else if(type.equals("image/svg+xml")) {
ext = "svg";
}

response.addHeader("Content-Disposition", "attachment; filename=chart." + ext);
response.addHeader("Content-Type", type);

if(null != t) {
TranscoderInput input = new TranscoderInput(new StringReader(svg));
TranscoderOutput output = new TranscoderOutput(out);
try {
t.transcode(input, output);
} catch(TranscoderException e) {
out.print("Problem transcoding stream. See the web logs for more details.");
e.printStackTrace();
}

} else if(ext == "svg") {
//                out.print(svg);
OutputStreamWriter writer = new OutputStreamWriter(out, "UTF-8");
writer.append(svg);
writer.close();
} else {
out.print("Invalid type: " + type);
}
} else {
response.addHeader("Content-Type", "text/html");
out.println("Usage:\n\tParameter [svg]: The DOM Element to be converted.\n\tParameter [type]: The destination MIME type for the elment to be transcoded.");
}
out.flush();
out.close();
}

}