利用awk自动生成DTO

大多用于ejb开发的工具都支持dto的自动生成，前提是必须已经存在对应的实体bean。在没有实体bean时，就得我们自己敲那些繁琐无聊毫无意义的代码。这种情况下，这个awk script也许可以帮点忙。 如果你不了解awk，可以去

http://www-900.ibm.com/developerWorks/cn/linux/shell/awk/awk-1/index.shtml

http://www-900.ibm.com/developerWorks/cn/linux/shell/awk/awk-2/index.shtml

http://www-900.ibm.com/developerWorks/cn/linux/shell/awk/awk-3/index.shtml

看看. 如果用的是windows，要想运行这个script，需要去down一个名为awk.exe的解释程序。

对文本要求的格式：

第一行 是 dto 的名字，

其余行 是"类型－变量名"对, 注意别加分号！

如下例：

User_DTO

int id

String name

Collection friends

以下斜体部分是script正文：

BEGIN{

count =0 ;

}

{

if(NF==2)

{

arr[count,0] = $1;

arr[count,1] = $2;

#print arr[count,0], arr[count,1], count;

count++;

}

if(NF==1)

dto = $1;

}

END{

printf("/* DTO created by awk*/\n\n");

printf("/*@todo Complete package & import here*/\n\n");

printf("public class %s implements Serializable\n{\n", dto);

for ( i=0; i< count; i++ ) {

x = arr[i,1];

arrx = arr[i,0];

printf("\tprivate %s %s;\n", arrx, x);

}

printf("\n\n");

printf("\tpublic %s()\n\t{\n\t}\n\n", dto);

printf("\tpublic %s(", dto);

for ( i=0; i< count; i++ ) {

x = arr[i,1];

arrx = arr[i,0];

printf("%s %s", arrx, x);

if(i!=count-1)

printf(", ");

}

printf(")\n\t{\n");

for ( i=0; i< count; i++ ) {

x = arr[i,1];

arrx = arr[i,0];

printf("\t\tthis.%s = %s;\n", x, x);

}

printf("\t}\n\n");

# setters & getters

for ( i=0; i< count; i++ ) {

x = arr[i,1];

arrx = arr[i,0];

xHead = toupper(substr(x,1,1));

xBody= substr(x,2,length(x)-1);

printf("\tpublic void set%s%s(%s %s)\n\t{\n", xHead, xBody, arrx, x);

printf("\t\tthis.%s = %s;\n", x, x);

printf("\t}\n\n");

printf("\tpublic %s get%s%s()\n\t{\n", arrx, xHead, xBody, arrx, x);

printf("\t\treturn %s;\n", x);

printf("\t}\n\n");

}

# equals

printf("\n\n");

printf("\tpublic boolean equals(Object obj)\n\t{\n");

printf("\t\tif (obj != null)\n\t\t{\n");

printf("\t\t\tif (this.getClass().equals(obj.getClass()))\n\t\t\t{\n");

printf("\t\t\t\t%s that = (%s) obj;\n", dto, dto);

printf("\t\t\t\treturn \n");

for ( i=0; i< count; i++ ) {

x = arr[i,1];

arrx = arr[i,0];

xHead = toupper(substr(x,1,1));

xBody= substr(x,2,length(x)-1);

if(arrx=="byte" || arrx=="char" || arrx=="int" || arrx=="long" || arrx=="float" || arrx=="double" || arrx=="boolean" )

{

printf("\t\t\t\t\tthis.get%s%s() == that.get%s%s() ", xHead, xBody, xHead, xBody);

}else

{

printf("\t\t\t\t\t(((this.get%s%s() == null) && (that.get%s%s() == null)) ||\n", xHead, xBody, xHead, xBody);

printf("\t\t\t\t\t\t(this.get%s%s() != null && this.get%s%s().equals(that.get%s%s())))", xHead, xBody, xHead, xBody, xHead, xBody);

}

if(i!=count-1)

printf(" && \n");

else

printf(";\n");

}

printf("\t\t\t}\n\t\t}\n\t\treturn false;\n\t}\n\n");

# hashCode()

printf("\tpublic int hashCode()\n\t{\n");

printf("\t\treturn (");

for ( i=0; i< count; i++ ) {

x = arr[i,1];

if(i!=0)

printf(" + ");

printf("\"\" + %s", x);

}

printf(").hashCode();");

printf("\n\t}\n\n");

# toString()

printf("\tpublic String toString()\n\t{\n");

printf("\t\treturn ");

for ( i=0; i< count; i++ ) {

x = arr[i,1];

if(i==0)

printf("\"\" + ");

else

printf(" + \",\" + ");

printf("%s", x);

}

printf(";");

printf("\n\t}\n\n");

printf("}");

}

#########################################################

# 如果有bug，请告诉我，thanks! :)

# Ed Yan, msn/email: huidaoren@hotmail.com

# 2004.03.30

#########################################################