这是一个java bean生成器，利用一个文本文件（不妨称为bean定义文件）生成java bean。

开发过程中我们可能会用到很多数据对象（值对象），大都被封装成一个bean。虽然各大

ide都提供了方便生成这种数据bean的工具，但都是一步一步填对话框式的，不像这个，

这个可以在一个文件里定义多个bean，一次生成所有bean。当然它也有局限性，目前只会

简单的生成private数据域和public 的setter、getter；并且不会替你导入必要的包。但尽管如此，

也能大大方便数据bean比较多，或bean字段比较多的应用。

bean定义文件（.bd）格式如下：

// 这是注释，以"//"打头。
// 用"#"表示bean名称。
// 注释不能和bean名称或数据字段写在同一行。
#mybean1
int i
long l
string s

#mybean2
string user
string pwd

#mybean3
object o
...

...



import java.io.*;
import java.util.*;


public class createbean {

private bufferedreader in;
private string inputfile;
private hashmap beans = new hashmap();
private static final char beanmark = '#';

public createbean(string inputfilename) {
inputfile = inputfilename;
try {
in = new bufferedreader(new filereader(inputfilename));
} catch (filenotfoundexception e) {
system.out.println("file " + inputfilename + " not found!");
e.printstacktrace();
}
}

public void generate() {
string ln = null;
string beanname = null;
arraylist properties = new arraylist();

try {
ln = in.readline().trim(); // throw io excption

while (ln != null) {
if(
( ln.length() < 1 ) ||
( ln.startswith("//") ) || // comments
( ln.charat(0)!=beanmark && ln.split("//s+").length!=2 )
){}
else if (ln.charat(0) == beanmark) {
if (beanname != null) {
beans.put(beanname, properties); // save last bean to hashmap
}

properties = new arraylist();

// gen new bean name
beanname = upperfirst(ln.substring(1));
system.out.println("bean: " + beanname);
}
else {
system.out.println("/t " + ln);
properties.add(ln);
}

ln = in.readline();
if(ln==null){ // last bean
if (beanname != null) {
beans.put(beanname, properties);
}
}
else{
ln = ln.trim();
}
} //while

system.out.println( beans.size() + " beans tested ...");
dumpbeans();

} catch (ioexception e) {
system.out.println("read file failed!");
} finally {
try {
if (in != null)
in.close();
} catch (ioexception e2) {
system.out.println("close input file failed!");
e2.printstacktrace();
}
}

}

public static string upperfirst(string s) {
stringbuffer buf = new stringbuffer(s);
if (buf.charat(0) >= 'a' && buf.charat(0) <= 'z') {
buf.setcharat(0, (char)(buf.charat(0) - 32));
}
return buf.tostring();
}

private void dumpbeans() {
system.out.println("creating ...");

stringbuffer buf = null;
string key = null;
printwriter pw = null;
iterator itr = null;
set keyset = beans.keyset();

if(keyset!=null)
itr = keyset.iterator();

while (itr.hasnext()) {
buf = new stringbuffer();
key = (string) itr.next();
arraylist l = (arraylist) beans.get(key);
buf.append("public class ");
buf.append(key);
buf.append(" {/r/n/n");

// add properties
for (int i = 0; i < l.size(); i++) {
buf.append("/tprivate ");
buf.append((string) l.get(i));
buf.append(";/r/n");
}
buf.append("/r/n");

// add getter and setter
for (int i = 0; i < l.size(); i++) {
// getter
string item = (string) l.get(i); // like "int a"
string type = item.split("//s+", 2)[0]; // tok needed!!!
string var = item.split("//s+", 2)[1];
buf.append("/tpublic "+ type + " get");
buf.append(upperfirst(var));
buf.append("() {/r/n/t/treturn this.");
buf.append(var);
buf.append(";/r/n/t}/n");

//setter
buf.append("/tpublic void set");
buf.append(upperfirst(var));
buf.append("(" + type + " " + var + ") {/r/n/t/tthis.");
buf.append(var);
buf.append(" = ");
buf.append(var);
buf.append(";/r/n/t}/n");
}
buf.append("}/r/n");

//dump to a named file
try{
pw = new printwriter(
new bufferedwriter(
new filewriter(key+".java")));
pw.write(buf.tostring());
pw.close();

}catch(ioexception e){
system.out.println("create java file failed!");
e.printstacktrace();
}

}

}

/********************************/

public static void main(string[] args) throws exception {

if(args.length<1){
system.out.println("usage:");
system.out.println("/tjava createbean yourinputfilename");
system.out.println("where your input file should like this:");
system.out.println("#mybean1");
system.out.println("int field1");
system.out.println("long field2");
system.out.println("string filed3");
system.out.println(".../n");
system.out.println("#mybean2");
system.out.println("char field1");
system.out.println("object field2");
system.out.println("...");
system.out.println("/n...");
return;
}
system.out.println("begin ...");
createbean cb = new createbean(args[0]);
cb.generate();
system.out.println("complete.");

}

}