系统win7-64位。当时我配置好的坏境变量是这样的：JAVA_HOME      C:\Program Files\Java\jdk1.7.0_17

                                                                    CLASSPATH        .;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

                                                                   PATH                  %JAVA_HOME%\bin;C:\WINDOWS\system32;C:\WINDOWS\;C:\WINDOWS\system32\Wbem;C;\Tcl\bin;%JAVA_HOME%\bin; %JAVA_HOME%\jre\bin;C:\Program Files (x86)\Android\android-sdk\tools;%JAVA_HOME%\bin;

后来PATH改成这样就好了：%JAVA_HOME%\bin;C:\WINDOWS\system32;C:\WINDOWS\;C:\WINDOWS\system32\Wbem;C;\Tcl\bin;%JAVA_HOME%\bin; %JAVA_HOME%\jre\bin;C:\Program Files (x86)\Android\android-sdk\tools;C:\Program Files\Java\jdk1.7.0_17\bin;