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$ npm install -g solc

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pragma solidity 0.4.19; 

contract hello { 

function main(uint a) constant returns (uint b)  

    { 

        uint result = a * 8; 

        return result; 

    } 

}

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$ solcjs <sol文件目录>   --optimize  --bin --abi --output-dir <输出目录>

//demo

$ solcjs F:\\hello.sol   --optimize  --bin --abi --output-dir F:\\

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Failed to write F:\F_\hello_sol_hello.bin: Error: ENOENT: no such file or directory, open 'F:\F_\hello_sol_hello.bin'

Failed to write F:\F_\hello_sol_hello.abi: Error: ENOENT: no such file or directory, open 'F:\F_\hello_sol_hello.abi'

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$ web3j solidity generate <编译的bin文件地址> <编译的abi文件地址> -o <输出目录> -p <java包名>

//demo

$ web3j solidity generate F:\F_\hello_sol_hello.bin F:\F_\hello_sol_hello.abi -o E:\etheth\src\main\java -p xyz.lihang.demo.eth.sol