先看一下XML文档

<?xml version="1.0" encoding="gb2312"?>
<exam> 
  <student idcard="111" examid="222"> 
    <name>张三</name>  
    <location>深圳</location>  
    <score>89</score> 
  </student>  
  <student idcard="777" examid="666"> 
    <name>李四</name>  
    <location>上海</location>  
    <score>99</score> 
  </student> 
</exam>

主要是对此文档读取,添加,删除,保存(刷新)等处理实现下面的功能

首先要建立一个学生的实体类

 1 public class Student {
 2     private String name;
 3     private String examid;//准考证号
 4     private String idcard;//身份证号
 5     private String location;//地址
 6     private String score; //分数
 7     
 8     
 9     public Student(){    //无参构造
10     }
11     
12     public Student(String name, String examid, String idcard, String location,
13             String score) {            //有参构造
14         super();
15         this.name = name;
16         this.examid = examid;
17         this.idcard = idcard;
18         this.location = location;
19         this.score = score;
20     }
21     //下面是set get 方法
22     public String getName() {
23         return name;
24     }
25     public void setName(String name) {
26         this.name = name;
27     }
28     public String getExamid() {
29         return examid;
30     }
31     public void setExamid(String examid) {
32         this.examid = examid;
33     }
34     public String getIdcard() {
35         return idcard;
36     }
37     public void setIdcard(String idcard) {
38         this.idcard = idcard;
39     }
40     public String getLocation() {
41         return location;
42     }
43     public void setLocation(String location) {
44         this.location = location;  
45     }
46     public String getScore() {
47         return score;
48     }
49     public void setScore(String score) {
50         this.score = score;
51     }
52     
53     
54     
55 }//类的

 

然后建立一个接口类,里面添加的方法分别是(添加,删除,读取)

 1 public interface AddStu {
 2     /**
 3      * 添加学生
 4      */
 5     public boolean addStudent(Student stu);
 6     /**
 7      * 删除学生
 8      */
 9     public boolean removeStudent(String name);
10     /**
11      * 查询学生
12      */
13     public Student caxunStudent(String examid);
14 }

然后是实现接口的类

  1 public class AddStuimpl implements AddStu{
  2     
  3     @Override
  4     public boolean addStudent(Student stu) {
  5         boolean flay=false;
  6         Document dom=null;
  7         //1.创建解析器
  8         SAXReader reader = new SAXReader();
  9         //2.解析文档
 10          try {
 11             dom = reader.read(new File("src/student.xml"));
 12             Element rootElement=dom.getRootElement();
 13             //添加元素
 14             Element stuEle=rootElement.addElement("student");
 15             stuEle.addAttribute("idcard", stu.getIdcard());
 16             stuEle.addAttribute("examid", stu.getExamid());
 17             //添加子节点
 18             stuEle.addElement("name").setText(stu.getName());
 19             stuEle.addElement("location").setText(stu.getLocation());
 20             stuEle.addElement("score").setText(stu.getScore());
 21             //更新XML  (保存信息)
 22             OutputFormat of=OutputFormat.createPrettyPrint();//格式化器
 23             of.setEncoding("gb2312");
 24             XMLWriter xw=new XMLWriter(new FileWriter("src/student.xml"),of);
 25             xw.write(dom);
 26             xw.close();
 27             
 28             flay=true;
 29         } catch (Exception e) {
 30             e.printStackTrace();
 31         }
 32         
 33         return flay;
 34         
 35     }
 36 
 37     @Override
 38     public boolean removeStudent(String name) {
 39         boolean flay=false;
 40         Document dom=null;
 41         //1.创建解析器
 42         SAXReader reader = new SAXReader();
 43         //2.解析文档
 44          
 45             try {
 46                 dom = reader.read(new File("src/student.xml"));
 47                 Element root=dom.getRootElement(); //获取根节点
 48                 List<Element> list=root.elements("student"); //选择要对哪个元素进行操作
 49                 for (Element e : list) {
 50                     Element nameEle=e.element("name");
 51                     if(nameEle.getText().equals(name)){
 52                         root.remove(e);
 53                         flay=true;
 54                     }
 55                     
 56                 }
 57                 //更新
 58                 OutputFormat of=OutputFormat.createPrettyPrint();//格式化器
 59                 of.setEncoding("gb2312");
 60                 XMLWriter xw=new XMLWriter(new FileWriter("src/student.xml"),of);
 61                 xw.write(dom);
 62                 xw.close();
 63                 
 64                 
 65             } catch (DocumentException e) {
 66                 // TODO Auto-generated catch block
 67                 e.printStackTrace();
 68             } catch (IOException e) {
 69                 // TODO Auto-generated catch block
 70                 e.printStackTrace();
 71             }
 72             
 73         return flay;
 74     }
 75 
 76     @Override
 77     public Student caxunStudent(String examid) {
 78         Student s=null;
 79         Document dom=null;
 80         //1.创建解析器
 81         SAXReader reader = new SAXReader();
 82         //2.解析文档
 83          try {
 84             dom = reader.read(new File("src/student.xml"));
 85             Element root=dom.getRootElement(); //获取根节点
 86             List<Element> list=root.elements("student");
 87             Element ele=null;
 88             for (Element e : list) {
 89                 String str2=e.attribute("examid").getText();
 90                 //String str2=e.attributeValue("examid");  与上一条意思一样
 91                 if(str2.equals(examid)){
 92                     ele=e;
 93                     break;
 94                 }
 95             }
 96             if(ele!=null){
 97                 String name=ele.elementText("name");
 98                 String location=ele.element("location").getText();
 99                 String score=ele.elementText("score");
100                 String idcard=ele.attributeValue("idcard");
101                 String examid1=ele.attributeValue("examid");
102                 s=new Student(name, examid1, idcard, location, score);
103             }
104                 } catch (DocumentException e) {
105                     
106                     e.printStackTrace();
107                 }
108         return s;
109     }
110 
111 }

最后则是测试类及对添加等方法的测试

 1 /**
 2  * 测试
 3  * 2017-5-3
 4  *下午2:40:47
 5  */
 6 public class StudentBiz {
 7     //static Student stu=new Student();
 8     static Scanner input=new Scanner(System.in);
 9     static AddStuimpl asi=new AddStuimpl();
10     public static void main(String[] args) {
11         System.out.println("添加学生(1)\t删除学生(2)\t查询成绩(3)\t退出(4)");
12         do{
13         System.out.print("请选择有效序号: ");
14         int a=input.nextInt();
15         switch(a){
16         case 1:
17             System.out.println("请输入学生的姓名");
18             String name=input.next();
19             System.out.println("请输入学生的准考证号");
20             String examid=input.next();
21             System.out.println("请输入学生的身份证号");
22             String idcard=input.next();
23             System.out.println("请输入学生的所在地");
24             String location=input.next();
25             System.out.println("请输入学生的成绩");
26             String score=input.next();
27             Student stu=new Student(name, examid, idcard, location, score);
28             
29             boolean bool=asi.addStudent(stu);
30             if(bool){
31                 System.out.println("学生添加成功");
32             }else{
33                 System.out.println("添加失败");
34             }
35             
36             continue;
37         case 2:
38             System.out.println("请输入要删除的学生姓名");
39             String removeName=input.next();
40             Student stu2=new Student();
41             //stu2.setName(removeName);
42             
43             RemoveStuImpl re=new RemoveStuImpl();
44             //boolean bool2=re.removeStu(stu2);
45             boolean bool2=asi.removeStudent(removeName);
46             if(bool2){
47                 System.out.println("删除成功");
48             }else{
49                 System.out.println("删除失败");
50             }
51             continue;
52         case 3:
53             System.out.println("请输入学生考号");
54             String examid1=input.next();
55             Student stu3=asi.caxunStudent(examid1);
56             if(stu3!=null){
57                 System.out.println("学生的身份证是"+stu3.getIdcard()+",准考证"+stu3.getExamid()+
58                         ",姓名"+stu3.getName()+",分数是: "+stu3.getScore()+",地址"+stu3.getLocation());
59             }else{
60                 System.out.println("查无此人");
61             }
62             continue;
63         case 4:
64             System.out.println("系统退出");
65             break;
66         }
67         break;
68     }while(true);
69     
70    }
71 }

 本文没有使用工具类,后续可自行添加!!!!!