Java从零开始学四十三(DOM4j解析XML)

// 建立XML    public static void gernatorXML() {        // 创建Document对象        Document doc = DocumentHelper.createDocument();        // 创建根节点students        Element studentsElement = doc.addElement("students");        // 创建子节点student        Element studentElement1 = studentsElement.addElement("student");        // 添加ID属性        studentElement1.addAttribute("id", "1001");        // 添加子节点        studentElement1.addElement("name").setText("张三");        studentElement1.addElement("age").setText("18");        studentElement1.addElement("sex").setText("男");        studentElement1.addElement("phone").setText("13800138000");        studentElement1.addElement("address").setText("深圳宝安");        // 再创建同样的2个student节点        Element studentElement2 = studentsElement.addElement("student");        // 添加ID属性        studentElement2.addAttribute("id", "10012");        // 添加子节点        studentElement2.addElement("name").setText("李四");        studentElement2.addElement("age").setText("19");        studentElement2.addElement("sex").setText("女");        studentElement2.addElement("phone").setText("13412369854");        studentElement2.addElement("address").setText("上海");        // 再创建同样的2个student节点        Element studentElement3 = studentsElement.addElement("student");        // 添加ID属性        studentElement3.addAttribute("id", "10013");        // 添加子节点        studentElement3.addElement("name").setText("王五");        studentElement3.addElement("age").setText("25");        studentElement3.addElement("sex").setText("女");        studentElement3.addElement("phone").setText("13410110104");        studentElement3.addElement("address").setText("广东");        try {            // 创建XML 将Document写入XML            // 设置格式            OutputFormat format = OutputFormat.createPRettyPrint();            // 设置字符编码也可以设置为gb2312或者gbk            format.setEncoding("utf-8");            // 输入            XMLWriter writer = new XMLWriter(                    new FileWriter("xml/students.xml"), format);            // 写入文档            writer.write(doc);            // 关闭流            writer.close();            // 输出提示            System.out.println("======写入成功=======");        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }

    // 读取XML    public static void getXML() {        try {            // 读取XML            SAXReader reader = new SAXReader();            Document doc = reader.read("xml/students.xml");            // 获取根节点            Element root = doc.getRootElement();            // 获取子节点集合            List<Element> stulList = root.elements();            // 遍历            for (Element ele : stulList) {                // 获取属性                String id = ele.attributeValue("id");                System.out.println("学生ID: " + id);                // 获取子节点的文本内容 name                String name = ele.elementText("name");                // age年龄                String age = ele.elementText("age");                // sex                String sex = ele.elementTextTrim("sex");                // phone                String phone = ele.elementTextTrim("phone");                // address                String address = ele.elementTextTrim("address");                System.out.println("姓名：" + name + "/t年龄:  " + age + "/t 性别:  "                        + sex + "/t/t电话：" + phone + "/t/t地址:  " + address);            }        } catch (DocumentException e) {            e.printStackTrace();        }    }

//增加新的节点    public static void addXML(){                try {            //读取XML创建解析器            SAXReader reader=new SAXReader();            //创建Document对象            Document doc=reader.read("xml/students.xml");            //获取根节点            Element root=doc.getRootElement();            //创建新的节点            Element student=root.addElement("student");            //添加属性            student.addAttribute("id", "10020");            //创建子节点            student.addElement("name").setText("张三丰");            student.addElement("age").setText("108");            student.addElement("sex").setText("男");            student.addElement("phone").setText("13800138001");            student.addElement("address").setText("武当山");            //写入XML            //设置字符编码和格式            OutputFormat format=new OutputFormat();            format.setEncoding("utf-8");            //创建输出流            XMLWriter writer=new XMLWriter(new FileWriter("xml/students.xml"), format);            //写入Document            writer.write(doc);            //关闭流            writer.close();            //给出提示            System.out.println("======增加成功=======");                    } catch (DocumentException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }            }

//修改节点内容根据 id10013将王五的姓名=王小五，年龄30，性别：男，电话：138000138000，地址：北京    public static void modify(){                try {            //创建SAXReader解析器            SAXReader reader=new SAXReader();            //创建Document            Document doc=reader.read("xml/students.xml");            //找到根节点            Element root=doc.getRootElement();            //子节点集合            List<Element> studentList=root.elements();            //遍历查找            for (Element ele : studentList) {                                if(ele.attributeValue("id").equals("10013")){                    ele.element("name").setText("王小五");                    ele.element("age").setText("30");                    ele.element("sex").setText("男");                    ele.element("phone").setText("138000138000");                    ele.element("address").setText("北京");                                    }            }                //写入XML                //设置字符格式和编码                OutputFormat format=new OutputFormat();                format.setEncoding("utf-8");                XMLWriter writer=new XMLWriter(new FileWriter("xml/students.xml"), format);                //将Document写入                writer.write(doc);                //关闭流                writer.close();                //给出提示                System.out.println("====修改成功====");                                                } catch (DocumentException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

/删除节点 删除王小五的节点    public static void delete(){                try {            //创建SAXReader 解析器            SAXReader reader=new SAXReader();            //创建Document对象            Document doc=reader.read("xml/students.xml");            //获取根节点            Element root=doc.getRootElement();            //集合            List<Element> stuList=root.elements();            //遍历            for (Element ele : stuList) {                if(ele.attributeValue("id").equals("10013")){                    //获取父节点，并删除这个节点                    ele.getParent().remove(ele);                }            }            //写入XML            //设置字符编码格式            OutputFormat format =new OutputFormat();            format.setEncoding("utf-8");            //输出流            XMLWriter writer=new XMLWriter(new FileWriter("xml/students.xml"), format);            writer.write(doc);            writer.close();            System.out.println("===删除成功===");                                                        } catch (DocumentException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }