fj-dc/.svn/pristine/b0/b0a98a7076680bb756087bffbac430ae32740598.svn-base

package cn.com.goldenwater.dcproj.utils;

import cn.com.goldenwater.dcproj.util.Base64Util;
import freemarker.template.Configuration;
import freemarker.template.Template;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.Map;

public class WordUtils {
    //配置信息,代码本身写的还是很可读的,就不过多注解了
    private static Configuration configuration = null;
    //这里注意的是利用WordUtils的类加载器动态获得模板文件的位置
    private static String templateFolder = WordUtils.class.getClassLoader().getResource("moban.ftl").getPath();

    static {
        configuration = new Configuration();
        configuration.setDefaultEncoding("utf-8");
        try {
            templateFolder = templateFolder.substring(0, templateFolder.indexOf("moban.ftl"));
            configuration.setDirectoryForTemplateLoading(new File(templateFolder));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private WordUtils() {
        throw new AssertionError();
    }

    public static void exportMillCertificateWord(HttpServletRequest request, HttpServletResponse response, Map map) throws IOException {
        Template freemarkerTemplate = configuration.getTemplate("moban.ftl");
        File file = null;
        InputStream fin = null;
        ServletOutputStream out = null;
        try {
            // 调用工具类的createDoc方法生成Word文档
            file = createDoc(map, freemarkerTemplate);
            fin = new FileInputStream(file);

            response.setCharacterEncoding("utf-8");
            response.setContentType("application/msword");
            // 设置浏览器以下载的方式处理该文件名
            String fileName = "督查简报" + ".doc";
            response.setHeader("Content-Disposition", "attachment;filename="
                    .concat(String.valueOf(URLEncoder.encode(fileName, "UTF-8"))));

            out = response.getOutputStream();
            byte[] buffer = new byte[512];  // 缓冲区
            int bytesToRead = -1;
            // 通过循环将读入的Word文件的内容输出到浏览器中
            while ((bytesToRead = fin.read(buffer)) != -1) {
                out.write(buffer, 0, bytesToRead);
            }
        } finally {
            if (fin != null) {
                fin.close();
            }
            if (out != null) {
                out.close();
            }
            if (file != null) {
                file.delete(); // 删除临时文件
            }
        }
    }

    private static File createDoc(Map<?, ?> dataMap, Template template) {
        String name = "test.doc";
        File f = new File(name);
        Template t = template;
        try {
            // 这个地方不能使用FileWriter因为需要指定编码类型否则生成的Word文档会因为有无法识别的编码而无法打开
            Writer w = new OutputStreamWriter(new FileOutputStream(f), StandardCharsets.UTF_8);
            t.process(dataMap, w);
            w.close();
        } catch (Exception ex) {
            ex.printStackTrace();
            throw new RuntimeException(ex);
        }
        return f;
    }

    /**
     * 对图片进行Base64编码
     *
     * @param filename 图片路径
     * @return Base64编码
     */
    public static String getImageString(String filename) {
        InputStream in = null;
        byte[] data = null;
        try {
            if (!new File(filename).exists()) {
                return "";
            }
            in = new FileInputStream(filename);
            data = new byte[in.available()];
            in.read(data);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return data != null ? Base64Util.encodeStr(data) : "";
    }
}