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前提准备：
1. 项目中至少需要引入的jar包，注意版本:
a) core-renderer.jar
b) freemarker-2.3.16.jar
c) iText-2.0.8.jar
d) iTextAsian.jar
上代码:
注释: 此类为自定义的Tag类的基类，在action中怎么放的数据，在ftl中就怎么取数据，简洁明了。
1. 自定义Tag类的基类
/**
* 通用的生成pdf预览和生成打印的html文件
*
* @author xg君
*
*/
public abstract class PDFTag extends BodyTagSupport {
private static final long serialVersionUID = 1L;
// 标签属性变量
private String json = "";
private String tempDir = "";
// 非标签属性变量
private Map<String, Object> rootMap = new HashMap<String, Object>();
private String templateStr = null;
private String freemarkereConfigurationBeanName = null;
private String fileName = null;
private String basePath = null;
private String fileEncoding = "utf-8";
@Override
public int doStartTag() throws JspException {
setConfigParams();
WebApplicationContext application = WebApplicationContextUtils.getWebApplicationContext(pageContext
.getServletContext());
doServiceStart();
String ctx = (String) pageContext.getAttribute("ctx");
rootMap.put("ctx", ctx);
Map<String, Object> map = parseJSON2Map(json);
rootMap.putAll(map);
if (freemarkereConfigurationBeanName == null) {
try {
throw new CstuException("FreemarkereConfigurationBeanName不能为空!");
} catch (CstuException e) {
e.printStackTrace();
}
}
Configuration cptFreemarkereConfiguration = (Configuration) application
.getBean(freemarkereConfigurationBeanName);
try {
if (templateStr == null) {
throw new CstuException("模板文件不能为空!");
}
Template template = cptFreemarkereConfiguration.getTemplate(templateStr);
if (basePath == null) {
throw new CstuException("文件的基本路径(父路径)不能为空!");
}
File htmlPath = new File(tempDir + File.separator + basePath);
if (!htmlPath.exists()) {
htmlPath.mkdirs();
}
if (fileName == null) {
throw new CstuException("生成的html文件名不能为空!");
}
File htmlFile = new File(htmlPath, File.separator + fileName);
if (!htmlFile.exists()) {
htmlFile.createNewFile();
}
BufferedWriter out = new BufferedWriter(
new OutputStreamWriter(new FileOutputStream(htmlFile), fileEncoding));
template.process(rootMap, out);
out.flush();
doServiceDoing();
// 显示在页面
template.process(rootMap, pageContext.getResponse().getWriter());
} catch (Exception e) {
e.printStackTrace();
}
doServiceEnd();
return SKIP_BODY;
}
/**
* 配置基础参数，如
*/
public abstract void setConfigParams();
/**
* 业务处理方法-开始 填充数据
*
* @return
*/
public abstract void doServiceStart();
/**
* 业务处理方法-执行中 备用，可空实现，若rootMap中存在双份数据则可在此处填充判断条件
*
* @return
*/
public abstract void doServiceDoing();
/**
* 业务处理方法-结束 清空rootMap并调用垃圾回收，也可空实现
*
* @return
*/
public abstract void doServiceEnd();
/**
* 将元素放入rootMap中
*/
public void putKV(String key, Object value) {
rootMap.put(key, value);
}
/**
* 将map放入rootMap中
*
* @param m
*/
public void putMap(Map m) {
rootMap.putAll(m);
}
public void clear() {
rootMap.clear();
rootMap = null;
}
/**
* 移除元素
*
* @param key
* @return
*/
public Object remove(String key) {
return rootMap.remove(key);
}
public static Map<String, Object> parseJSON2Map(String jsonStr) {
Map<String, Object> map = new HashMap<String, Object>();
JSONObject json = JSONObject.fromObject(jsonStr);
for (Object k : json.keySet()) {
Object v = json.get(k);
if (v instanceof JSONArray) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
Iterator<JSONObject> it = ((JSONArray) v).iterator();
while (it.hasNext()) {
JSONObject json2 = it.next();
list.add(parseJSON2Map(json2.toString()));
}
map.put(k.toString(), list);
} else {
map.put(k.toString(), v);
}
}
return map;
}
public String getJson() {
return json;
}
public void setJson(String json) {
this.json = json;
}
public String getTempDir() {
return tempDir;
}
public void setTempDir(String tempDir) {
this.tempDir = tempDir;
}
public String getTemplateStr() {
return templateStr;
}
public void setTemplateStr(String templateStr) {
this.templateStr = templateStr;
}
public String getFreemarkereConfigurationBeanName() {
return freemarkereConfigurationBeanName;
}
public void setFreemarkereConfigurationBeanName(String freemarkereConfigurationBeanName) {
this.freemarkereConfigurationBeanName = freemarkereConfigurationBeanName;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public String getBasePath() {
return basePath;
}
public void setBasePath(String basePath) {
this.basePath = basePath;
}
public String getFileEnco | 
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