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: [email protected] # 2004.03.30 ######################################################### 
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