Unable to locate tools.jar. Expected to find it in C:/Program Files/Java/jre

在命令行敲ant命令后提示：“Unable to locate tools.jar. Expected to find it in C:/Program Files/Java/jre1.5.0_05/lib”；ANT_HOME环境变量已经配置；

解决途径：将“C:/Program Files/Java/jdk1.5.0_05/lib”目录下的tools.jar文件拷贝到“C:/Program Files/Java/jre1.5.0_05/lib”目录下，重新运行命令ant，运行正常，问题解决。