CDO的全称为Common Data Object 是公用数据结构的意思，这是抽象的一种新型的数据结构，可以设置基本的数据类型，比如：byte、short、int、long、float、double、String，也可以存储这些类型的数组，同样，CDO里可以嵌套新的CDO或者CDO数组，这种数据结构几乎是万能的数据结构，它可以很方便的转化为XML表示，也可以很方便的转化为Json的表示，同样XML或者Json也可以很方便的转化为CDO对象，设想有如下的代码：
如果将它转化为XML表示如下：
如果将这个对象转化为Json，将会有如下的表示：
每个实体bean对应一个Class，如果实体多的话维护起来会很不方便，通过CDO，省去了这些代码：
它们的XML表示分别为：
通过如下的代码便可转化为CDO对象：
这样便可打印出如下的Json字符串：
01 | CDO cdo1= new CDO(); |
02 | cdo1.setIntegerValue("classid", 1); |
03 | cdo1.setStringValue("classname", "一年级一班"); |
04 | cdo1.setStringArrayValue("alias",new String[]{"尖子班级","优秀班级"} ); |
05 | cdo1.setStringArrayValue("students", new String[]{"张三","李四"}); |
06 | CDO scdo1= new CDO(); |
07 | scdo1.setStringValue("username", "userone"); |
08 | scdo1.setStringValue("password", "......."); |
09 | scdo1.setIntegerValue("age", 18); |
10 | cdo1.setCDOValue("scdo1", scdo1); |
01 | <?xml version="1.0" encoding="UTF-8"?> |
02 | <CDO> |
03 | <NF N="classid" V="1"/> |
04 | <STRF N="classname" V="一年级一班"/> |
05 | <STRAF N="alias"> |
06 | <STR>尖子班级</STR> |
07 | <STR>优秀班级</STR> |
08 | </STRAF> |
09 | <STRAF N="students"> |
10 | <STR>张三</STR> |
11 | <STR>李四</STR> |
12 | </STRAF> |
13 | <CDOF N="scdo1"> |
14 | <CDO> |
15 | <STRF N="username" V="userone"/> |
16 | <STRF N="password" V="..........."/> |
17 | <NF N="age" V="18"/> |
18 | </CDO> |
19 | </CDOF> |
20 | </CDO> |
01 | { |
02 | "classid":1, |
03 | "classname":"一年级一班", |
04 | "alias":[ |
05 | "尖子班级", |
06 | "优秀班级" |
07 | ], |
08 | "students":[ |
09 | "张三", |
10 | "李四" |
11 | ], |
12 | "scdo1":{ |
13 | "username":"userone", |
14 | "password":"...........", |
15 | "age":18 |
16 | } |
17 | } |
可以看出CDO这个数据结构还是设计的是非常优秀的。
在我们以往的开发中，如果大家稍加思索的话，大家都在写好多好多的bean，每个bean对应一个实体Entity,这样在开发大型的项目的过程中会感觉不合理，通过CDO这个结构，不需要针对每个entity都编写一个java bean类，假若我们有学生和班级两类实体，如果是按照以往的设计，可能会先设计出两个bean class：
01 | package com.google.beans; |
02 |
03 | public class Student |
04 | { |
05 | private Integer id; |
06 | private String username; |
07 | private String address; |
08 | private boolean sex; |
09 | private double height; |
10 | public Integer getId() |
11 | { |
12 | return id; |
13 | } |
14 | public void setId(Integer id) |
15 | { |
16 | this.id = id; |
17 | } |
18 | public String getUsername() |
19 | { |
20 | return username; |
21 | } |
22 | public void setUsername(String username) |
23 | { |
24 | this.username = username; |
25 | } |
26 | public String getAddress() |
27 | { |
28 | return address; |
29 | } |
30 | public void setAddress(String address) |
31 | { |
32 | this.address = address; |
33 | } |
34 | public boolean isSex() |
35 | { |
36 | return sex; |
37 | } |
38 | public void setSex(boolean sex) |
39 | { |
40 | this.sex = sex; |
41 | } |
42 | public double getHeight() |
43 | { |
44 | return height; |
45 | } |
46 | public void setHeight(double height) |
47 | { |
48 | this.height = height; |
49 | } |
50 | } |
01 | package com.google.beans; |
02 |
03 | public class Classes |
04 | { |
05 | private Integer classId; |
06 | private String className; |
07 | private Student[] students; |
08 | public Integer getClassId() |
09 | { |
10 | return classId; |
11 | } |
12 | public void setClassId(Integer classId) |
13 | { |
14 | this.classId = classId; |
15 | } |
16 | public String getClassName() |
17 | { |
18 | return className; |
19 | } |
20 | public void setClassName(String className) |
21 | { |
22 | this.className = className; |
23 | } |
24 | public Student[] getStudents() |
25 | { |
26 | return students; |
27 | } |
28 | public void setStudents(Student[] students) |
29 | { |
30 | this.students = students; |
31 | } |
32 | } |
01 | CDO cdoStudent1 = new CDO(); |
02 | cdoStudent1.setIntegerValue("id", 1); |
03 | cdoStudent1.setStringValue("username", "userone"); |
04 | cdoStudent1.setStringValue("address", "上海市。。。。。。"); |
05 | cdoStudent1.setBooleanValue("sex", true); |
06 | cdoStudent1.setDoubleValue("height", 1.74); |
07 |
08 | CDO cdoStudent2 = new CDO(); |
09 | cdoStudent2.setIntegerValue("id", 2); |
10 | cdoStudent2.setStringValue("username", "usertwo"); |
11 | cdoStudent2.setStringValue("address", "深圳市"); |
12 | cdoStudent2.setBooleanValue("sex", false); |
13 | cdoStudent2.setDoubleValue("height", 1.67); |
14 |
15 | CDO cdoClasses = new CDO(); |
16 | cdoClasses.setIntegerValue("classId", 1); |
17 | cdoClasses.setStringValue("className", "一年级一班"); |
18 | cdoClasses.setCDOArrayValue("students", new CDO[]{cdoStudent1,cdoStudent2}); |
1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <CDO> |
3 | <NF N="id" V="1"/> |
4 | <STRF N="username" V="userone"/> |
5 | <STRF N="address" V="上海市。。。。。。"/> |
6 | <BF N="sex" V="true"/> |
7 | <DBLF N="height" V="1.74"/> |
8 | </CDO> |
1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <CDO> |
3 | <NF N="id" V="2"/> |
4 | <STRF N="username" V="usertwo"/> |
5 | <STRF N="address" V="深圳市"/> |
6 | <BF N="sex" V="false"/> |
7 | <DBLF N="height" V="1.67"/> |
8 | </CDO> |
01 | <?xml version="1.0" encoding="UTF-8"?> |
02 | <CDO> |
03 | <NF N="classId" V="1"/> |
04 | <STRF N="className" V="一年级一班"/> |
05 | <CDOAF N="students"> |
06 | <CDO> |
07 | <NF N="id" V="1"/> |
08 | <STRF N="username" V="userone"/> |
09 | <STRF N="address" V="上海市。。。。。。"/> |
10 | <BF N="sex" V="true"/> |
11 | <DBLF N="height" V="1.74"/> |
12 | </CDO> |
13 | <CDO> |
14 | <NF N="id" V="2"/> |
15 | <STRF N="username" V="usertwo"/> |
16 | <STRF N="address" V="深圳市"/> |
17 | <BF N="sex" V="false"/> |
18 | <DBLF N="height" V="1.67"/> |
19 | </CDO> |
20 | </CDOAF> |
21 | </CDO> |
非常的清晰明了！
CDO不但能方便地转化为XML表示，而且能很方便的把XML文本串转化为CDO对象，假设有如下的XML文本串：
01 | <?xml version="1.0" encoding="UTF-8"?> |
02 | <CDO> |
03 | <CDOF N="cdoReturn"> |
04 | <CDO> |
05 | <NF N="nCode" V="0"/> |
06 | <STRF N="strText" V="OK"/> |
07 | <STRF N="strInfo" V="OK"/> |
08 | </CDO> |
09 | </CDOF> |
10 | <CDOF N="cdoResponse"> |
11 | <CDO> |
12 | <CDOAF N="cdosMember"> |
13 | <CDO> |
14 | <NF N="uid" V="5"/> |
15 | <STRF N="username" V="wanghui"/> |
16 | <STRF N="password" V="e4994c81a0c0db8e1ab137f9fdf7d5ae"/> |
17 | <STRF N="secques" V=""/> |
18 | </CDO> |
19 | <CDO> |
20 | <NF N="uid" V="353"/> |
21 | <STRF N="username" V="bainiuwang"/> |
22 | <STRF N="password" V="35b36dd98779303e3cdc84ff3951be9e"/> |
23 | <STRF N="secques" V=""/> |
24 | </CDO> |
25 | <CDO> |
26 | <NF N="uid" V="636"/> |
27 | <STRF N="username" V="wangli3849"/> |
28 | <STRF N="password" V="e3b2b5b80d57c3254c0ed1a83059d7ce"/> |
29 | <STRF N="secques" V=""/> |
30 | </CDO> |
31 | <CDO> |
32 | <NF N="uid" V="1006"/> |
33 | <STRF N="username" V="wangle520208"/> |
34 | <STRF N="password" V="059e5d9a6347d61859d7e2b740ef721b"/> |
35 | <STRF N="secques" V=""/> |
36 | </CDO> |
37 | <CDO> |
38 | <NF N="uid" V="1087"/> |
39 | <STRF N="username" V="wangyuepeng"/> |
40 | <STRF N="password" V="a5c74d745f45875d62fb418ed7e65ebb"/> |
41 | <STRF N="secques" V=""/> |
42 | </CDO> |
43 | </CDOAF> |
44 | <NF N="count" V="5"/> |
45 | </CDO> |
46 | </CDOF> |
47 | </CDO> |
01 | StringBuilder builder = new StringBuilder(); |
02 | builder.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>"); |
03 | builder.append("<CDO>"); |
04 | builder.append(" <CDOF N=\"cdoReturn\">"); |
05 | builder.append(" <CDO>"); |
06 | builder.append(" <NF N=\"nCode\" V=\"0\"/>"); |
07 | builder.append(" <STRF N=\"strText\" V=\"OK\"/>"); |
08 | builder.append(" <STRF N=\"strInfo\" V=\"OK\"/>"); |
09 | builder.append(" </CDO>"); |
10 | builder.append(" </CDOF>"); |
11 | builder.append(" <CDOF N=\"cdoResponse\">"); |
12 | builder.append(" <CDO>"); |
13 | builder.append(" <CDOAF N=\"cdosMember\">"); |
14 | builder.append(" <CDO>"); |
15 | builder.append(" <NF N=\"uid\" V=\"5\"/>"); |
16 | builder.append(" <STRF N=\"username\" V=\"wanghui\"/>"); |
17 | builder.append(" <STRF N=\"password\" V=\"e4994c81a0c0db8e1ab137f9fdf7d5ae\"/>"); |
18 | builder.append(" <STRF N=\"secques\" V=\"\"/>"); |
19 | builder.append(" </CDO>"); |
20 | builder.append(" <CDO>"); |
21 | builder.append(" <NF N=\"uid\" V=\"353\"/>"); |
22 | builder.append(" <STRF N=\"username\" V=\"bainiuwang\"/>"); |
23 | builder.append(" <STRF N=\"password\" V=\"35b36dd98779303e3cdc84ff3951be9e\"/>"); |
24 | builder.append(" <STRF N=\"secques\" V=\"\"/>"); |
25 | builder.append(" </CDO>"); |
26 | builder.append(" <CDO>"); |
27 | builder.append(" <NF N=\"uid\" V=\"636\"/>"); |
28 | builder.append(" <STRF N=\"username\" V=\"wangli3849\"/>"); |
29 | builder.append(" <STRF N=\"password\" V=\"e3b2b5b80d57c3254c0ed1a83059d7ce\"/>"); |
30 | builder.append(" <STRF N=\"secques\" V=\"\"/>"); |
31 | builder.append(" </CDO>"); |
32 | builder.append(" <CDO>"); |
33 | builder.append(" <NF N=\"uid\" V=\"1006\"/>"); |
34 | builder.append(" <STRF N=\"username\" V=\"wangle520208\"/>"); |
35 | builder.append(" <STRF N=\"password\" V=\"059e5d9a6347d61859d7e2b740ef721b\"/>"); |
36 | builder.append(" <STRF N=\"secques\" V=\"\"/>"); |
37 | builder.append(" </CDO>"); |
38 | builder.append(" <CDO>"); |
39 | builder.append(" <NF N=\"uid\" V=\"1087\"/>"); |
40 | builder.append(" <STRF N=\"username\" V=\"wangyuepeng\"/>"); |
41 | builder.append(" <STRF N=\"password\" V=\"a5c74d745f45875d62fb418ed7e65ebb\"/>"); |
42 | builder.append(" <STRF N=\"secques\" V=\"\"/>"); |
43 | builder.append(" </CDO>"); |
44 | builder.append(" </CDOAF>"); |
45 | builder.append(" <NF N=\"count\" V=\"5\"/>"); |
46 | builder.append(" </CDO>"); |
47 | builder.append(" </CDOF>"); |
48 | builder.append("</CDO>"); |
49 | |
50 | CDO cdoResponse = CDO.fromXML(builder.toString()); |
51 | System.out.println(cdoResponse.toJSON()); |
01 | { |
02 | "cdoReturn":{ |
03 | "nCode":0, |
04 | "strText":"OK", |
05 | "strInfo":"OK" |
06 | }, |
07 | "cdoResponse":{ |
08 | "cdosMember":[ |
09 | { |
10 | "uid":5, |
11 | "username":"wanghui", |
12 | "password":"e4994c81a0c0db8e1ab137f9fdf7d5ae", |
13 | "secques":"" |
14 | }, |
15 | { |
16 | "uid":353, |
17 | "username":"bainiuwang", |
18 | "password":"35b36dd98779303e3cdc84ff3951be9e", |
19 | "secques":"" |
20 | }, |
21 | { |
22 | "uid":636, |
23 | "username":"wangli3849", |
24 | "password":"e3b2b5b80d57c3254c0ed1a83059d7ce", |
25 | "secques":"" |
26 | }, |
27 | { |
28 | "uid":1006, |
29 | "username":"wangle520208", |
30 | "password":"059e5d9a6347d61859d7e2b740ef721b", |
31 | "secques":"" |
32 | }, |
33 | { |
34 | "uid":1087, |
35 | "username":"wangyuepeng", |
36 | "password":"a5c74d745f45875d62fb418ed7e65ebb", |
37 | "secques":"" |
38 | } |
39 | ], |
40 | "count":5 |
41 | } |
42 | } |
确实是非常的方便！
CDO数据结构是整个CDO框架的核心，理解并掌握了这个数据接口，可以说掌握了CDO框架的百分之六十！
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