java 下载word freemaker

@Service
public class DownLoadServiceImpl implements DownLoadService { @Override
public void downLoad(HttpServletResponse response, String wordName) {
Map<?, ?> root = initData(); //数据源对象
String template = "/template/UserList.ftl"; //模板文件的地址
String path = "E:\\UserList.doc"; //生成的word文档的输出地址
ByteArrayOutputStream byteArrayOutputStream = WordUtil.process(root, template);
try {
DownLoadUtil.download(byteArrayOutputStream,response,wordName);
} catch (IOException e) {
e.printStackTrace();
} } private Map<?, ?> initData() {
Map<String, Object> root = new HashMap<String, Object>(); List<User> users = new ArrayList<User>();
User zhangsan = new User("小姐姐", "倾国倾城");
User lisi = new User("沉鱼落雁", "闭月羞花");
//User wangwu = new User("王五", "789");
users.add(zhangsan);
users.add(lisi);
//users.add(wangwu); root.put("users", users);
root.put("title", "用户列表"); return root;
}
}

public class DownLoadUtil { /**
* @param byteArrayOutputStream 将文件内容写入ByteArrayOutputStream
* @param response HttpServletResponse 写入response
* @param returnName 返回的文件名
*/
public static void download(ByteArrayOutputStream byteArrayOutputStream, HttpServletResponse response, String returnName) throws IOException {
response.setContentType("application/msword");
response.setHeader("Content-Disposition", "attachment; filename=" + returnName);
response.setContentLength(byteArrayOutputStream.size());
OutputStream outputstream = response.getOutputStream(); //取得输出流
byteArrayOutputStream.writeTo(outputstream); //写到输出流
byteArrayOutputStream.close(); //关闭
outputstream.flush(); //刷数据
}
}

public class WordUtil { private static Configuration configuration = null; private WordUtil() {
throw new AssertionError();
} /**
* 根据模板生成相应的文件
* @param root 保存数据的map
* @param template 模板文件的地址
* @param
* @return
*/
public static synchronized ByteArrayOutputStream process(Map<?, ?> root, String template) { if (null == root ) {
throw new RuntimeException("数据不能为空");
} if (null == template) {
throw new RuntimeException("模板文件不能为空");
} ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
String templatePath = template.substring(0, template.lastIndexOf("/"));
String templateName = template.substring(template.lastIndexOf("/") + 1, template.length()); if (null == configuration) {
configuration = new Configuration(Configuration.VERSION_2_3_23); // 这里Configurantion对象不能有两个，否则多线程访问会报错
configuration.setDefaultEncoding("utf-8");
configuration.setClassicCompatible(true);
}
configuration.setClassForTemplateLoading(WordUtil.class, templatePath); Template t = null;
try {
t = configuration.getTemplate(templateName);
Writer w = new BufferedWriter(new OutputStreamWriter(outputStream, "utf-8"));
t.process(root, w); // 这里w是一个输出地址，可以输出到任何位置，如控制台，网页等
w.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
return outputStream;
}}

public class User { private String name; private String password; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public User(String name, String password) {
this.name = name;
this.password = password;
} public User() {
}}

<dependency>
<groupId>org.freemarker</groupId>
<artifactId>freemarker</artifactId>
<version>2.3.28</version>
</dependency>