clob保存为本地xml文件，修改后上传

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * @author GuoDi-CT DC
 *
 */

public class ClobModify {

	/**
	 *@param id 数据库中的ID
	 * 返回 保存文件的绝对路径
	 */
	public static String ClobToXml(int id) {
	Connection conn = DB.getConn();
	Statement stmt = DB.createStmt(conn);
	String sql = "select * from BD_PROCESS_DEF_VER where ID =" + id;
	ResultSet rs = DB.getRs(stmt, sql);
	String xmlFile = null;

	try {
	if (rs.next()) {
	int fjbh = rs.getInt(1);
	xmlFile = "d:\\xml\\" + fjbh + ".xml";
	Clob clob = rs.getClob(16);
	FileOutputStream fo = new FileOutputStream(xmlFile);
	OutputStreamWriter so = new OutputStreamWriter(fo, "UTF-8");
	if (clob != null) {
	Reader is = clob.getCharacterStream();
	BufferedReader br = new BufferedReader(is);
	String s = br.readLine();
	while (s != null) {
	so.write(s + System.getProperty("line.separator"));
// System.out.println(str);
	s = br.readLine();
	}
	}
	so.flush();
	so.close();
	}
	} catch (SQLException | IOException e) {
	e.printStackTrace();
	}
	DB.close(rs);
	DB.close(stmt);
	DB.close(conn);
	return xmlFile;
	}

	public static void updateClob(String fileName, int id) {

	FileInputStream fis = null;
	InputStreamReader rd = null;
	
	try {
	fis = new FileInputStream(fileName);
	rd = new InputStreamReader(fis, "UTF-8");
	} catch (FileNotFoundException e2) {
	e2.printStackTrace();
	} catch (UnsupportedEncodingException e) {
	e.printStackTrace();
	}

	PreparedStatement pst = null;
	Connection conn = DB.getConn();
	Statement stmt = DB.createStmt(conn);
	try {
	conn.setAutoCommit(false);
	} catch (SQLException e1) {
	e1.printStackTrace();
	}

	String sql1 = "update BD_PROCESS_DEF_VER s set s.NODE_INFO=' ' where ID="
	+ id; // 这边需要设置一个空的字段，后面就不会出现空指针
	try {
	stmt.execute(sql1);
	} catch (SQLException e) {
	e.printStackTrace();
	}
	
	String sql2 = "select * from BD_PROCESS_DEF_VER s where s.ID=" + id;
	// 锁定数据行进行更新，注意“for update”语句
	ResultSet rs = null;
	try {
	rs = stmt.executeQuery(sql2);
	} catch (SQLException e) {
	e.printStackTrace();
	}
	
	try {
	while (rs.next()) {
	String sql3 = "update BD_PROCESS_DEF_VER set NODE_INFO= ? where ID="+ id;
	pst = conn.prepareStatement(sql3);
	pst.setCharacterStream(1, rd, 100000000);
	pst.executeUpdate();
	}
	// 最后一步自己提交
	conn.commit();
	conn.setAutoCommit(true);

	} catch (SQLException e) {
	e.printStackTrace();
	} finally {
	DB.close(rs);
	DB.close(stmt);
	try {
	pst.close();
	} catch (SQLException e) {
	e.printStackTrace();
	}
	DB.close(conn);
	}
	}
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * @author GuoDi-CT DC 
 * jdcbc JavaBean
 * 
 */
public class DB {
	// 驱动程序就是之前在classpath中配置的JDBC的驱动程序的JAR 包中
	public static final String DBDRIVER = "oracle.jdbc.driver.OracleDriver";
	// 连接地址是由各个数据库生产商单独提供的，所以需要单独记住
	public static final String DBURL = "jdbc:oracle:thin:@172.17.20.215:1521:BPMIDE";
	// 连接数据库的用户名
	public static final String DBUSER = "bpmduser";
	// 连接数据库的密码
	public static final String DBPASS = "bpmd";

	public static Connection getConn() {
	Connection conn = null;
	try {
	Class.forName(DBDRIVER);
	conn = DriverManager.getConnection(DBURL, DBUSER, DBPASS); // 2、连接数据库
	} catch (ClassNotFoundException e) {
	e.printStackTrace();
	} // 1、使用CLASS 类加载驱动程序
	catch (SQLException e) {
	e.printStackTrace();
	}
	return conn;
	}

	public static Statement createStmt(Connection conn) {
	Statement stmt = null;
	try {
	stmt = conn.createStatement();
	} catch (SQLException e) {
	e.printStackTrace();
	}
	return stmt;
	}

	public static ResultSet getRs(Statement stmt, String sql) {
	ResultSet rs = null;
	try {
	rs = stmt.executeQuery(sql);
	} catch (SQLException e) {
	e.printStackTrace();
	}
	return rs;
	}

	public static void close(ResultSet rs) {
	if (rs != null) {
	try {
	rs.close();
	} catch (SQLException e) {
	e.printStackTrace();
	} finally {
	rs = null;
	}
	}
	}

	public static void close(Statement stmt) {
	if (stmt != null) {
	try {
	stmt.close();
	} catch (SQLException e) {
	e.printStackTrace();
	} finally {
	stmt = null;
	}
	}
	}

	public static void close(Connection conn) {
	if (conn != null) {
	try {
	conn.close();
	} catch (SQLException e) {
	// TODO Auto-generated catch block
	e.printStackTrace();
	} finally {
	conn = null;
	}
	}
	}
}

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * 
 * @author zhangwen.ctdc DOM更新与解析XML文档
 */
public class XmlAnalysis /* implements XmlDocumentInterface */{
	private Document document;

	public void init() {
	try {
	DocumentBuilderFactory factory = DocumentBuilderFactory
	.newInstance();
	DocumentBuilder builder = factory.newDocumentBuilder();
	this.document = builder.newDocument();
	} catch (ParserConfigurationException e) {
	System.out.println(e.getMessage());
	}
	}

	public void insertElementNode(String fileName, String nodeName,
	String newElementName) {
	document = parserXml(fileName);

	NodeList nodeList = document.getElementsByTagName(nodeName);

	for (int i = 0; i < nodeList.getLength(); i++) {
	Element element = document.createElement(newElementName);
	nodeList.item(i).appendChild(element);
	}

	createXml(fileName);

	}

	public void insertAttrNode(String fileName, String nodeName,
	String newAttrName, String attrValue) {
	document = parserXml(fileName);

	NodeList nodeList = document.getElementsByTagName(nodeName);
	for (int i = 0; i < nodeList.getLength(); i++) {
	Element element = (Element) (nodeList.item(i));
	element.setAttribute(newAttrName, attrValue);
	}

	createXml(fileName);
	}

	public void insertTextNode(String fileName, String nodeName, String textNode) {
	document = parserXml(fileName);

	NodeList nodeList = document.getElementsByTagName(nodeName);
	for (int i = 0; i < nodeList.getLength(); i++) {
	nodeList.item(i).appendChild(document.createTextNode(textNode));
	}
	createXml(fileName);

	}

	public void deleteElementNode(String fileName, String nodeName) {
	document = parserXml(fileName);

	NodeList nodeList = document.getElementsByTagName(nodeName);

	while (nodeList.getLength() > 0) {
	nodeList.item(0).getParentNode().removeChild(nodeList.item(0));
	nodeList = document.getElementsByTagName(nodeName);
	}

	createXml(fileName);
	}

	public void updateNode(String fileName, String nodeName, String attrName,
	String newAttrValue) {
	document = parserXml(fileName);

	NodeList nodeList = document.getElementsByTagName(nodeName);
	for (int i = 0; i < nodeList.getLength(); i++) {
	Element node = (Element) nodeList.item(i);
	node.setAttribute(attrName, newAttrValue);
	}

	createXml(fileName);
	}

	private Document parserXml(String fileName) {
	try {
	DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
	DocumentBuilder db = dbf.newDocumentBuilder();
	Document document = db.parse(fileName);

	System.out.println("-----------------------------------" + "解析完毕"
	+ "----------------------------------------");
	return document;

	} catch (FileNotFoundException e) {
	System.out.println(e.getMessage());
	} catch (ParserConfigurationException e) {
	System.out.println(e.getMessage());
	} catch (SAXException e) {
	System.out.println(e.getMessage());
	} catch (IOException e) {
	System.out.println(e.getMessage());
	}
	return document;
	}

	private void createXml(String fileName) {
	try {
	/** 将document中的内容写入文件中 */
	TransformerFactory tFactory = TransformerFactory.newInstance();
	Transformer transformer = tFactory.newTransformer();
	transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
	transformer.setOutputProperty(OutputKeys.INDENT, "yes");
	DOMSource source = new DOMSource(document);
	StreamResult result = new StreamResult(new FileOutputStream(
	fileName));
	transformer.transform(source, result);
	System.out.println("--------------------------------"
	+ "更新 XML文件成功" + "-------------------------------------");
	} catch (Exception exception) {
	System.out.println("更新" + fileName + "出错：" + exception);
	exception.printStackTrace();
	}

	}
}

/**
 * @author GuoDi and ZhangWen
 *
 */
public interface NodeInfoInterface {
 
 /** 
 * XML文档 插元素入节点
 * @param time 时间
 * @param nodeName 标签名
 * @param newElementName 新标签
 */ 
 public void insertElementNode(String time, String nodeName,String newElementName);
	
 /** 
 * @param time 时间
 * @param nodeName 标签名
 * @param newAttrName 新属性名
 * @param attrValue 新属性值
 * XML文档 插入属性节点
 */ 
 public void insertAttrNode(String time,String nodeName,String newAttrName,String attrValue);
	
 /** 
 * @param time 时间
 * @param nodeName 标签名
 * @param textNode 文本
 * XML文档 插入文本节点
 */ 
 public void insertTextNode(String time,String nodeName,String textNode);
	
 /** 
 * @param time 时间
 * @param nodeName 标签名
 * XML文档 删除所有对应元素节点
 */ 
 public void deleteElementNode(String time,String nodeName);
	
 /** 
 * @param time 时间
 * @param nodeName 标签名
 * @param newAttrName 新属性名
 * @param attrValue 新属性值
 * XML文档 修改属性节点内容
 */ 
 public void updateNode(String time,String nodeName,String newAttrName,String attrValue);
	
}